src/plugins/nat/nat44-ei/nat44_ei.c

   1 /*
   2  * nat44_ei.c - nat44 endpoint dependent plugin
   3  *
   4  * Copyright (c) 2020 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  13  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  14  * License for the specific language governing permissions and limitations
  15  * under the License.
  16  */
  17
  18 #include <vnet/plugin/plugin.h>
  19 #include <vpp/app/version.h>
  20
  21 #include <vnet/vnet.h>
  22 #include <vnet/ip/ip.h>
  23 #include <vnet/ip/ip4.h>
  24 #include <vnet/ip/ip_table.h>
  25 #include <vnet/ip/reass/ip4_sv_reass.h>
  26 #include <vnet/fib/fib_table.h>
  27 #include <vnet/fib/ip4_fib.h>
  28 #include <vnet/plugin/plugin.h>
  29
  30 // nat lib
  31 #include <nat/lib/log.h>
  32 #include <nat/lib/nat_syslog.h>
  33 #include <nat/lib/nat_inlines.h>
  34 #include <nat/lib/ipfix_logging.h>
  35
  36 #include <nat/nat44-ei/nat44_ei_dpo.h>
  37 #include <nat/nat44-ei/nat44_ei_inlines.h>
  38 #include <nat/nat44-ei/nat44_ei.h>
  39
  40 nat44_ei_main_t nat44_ei_main;
  41
  42 extern vlib_node_registration_t nat44_ei_hairpinning_node;
  43 extern vlib_node_registration_t nat44_ei_hairpin_dst_node;
  44 extern vlib_node_registration_t
  45   nat44_ei_in2out_hairpinning_finish_ip4_lookup_node;
  46 extern vlib_node_registration_t
  47   nat44_ei_in2out_hairpinning_finish_interface_output_node;
  48
  49 #define skip_if_disabled()                                                    \
  50   do                                                                          \
  51     {                                                                         \
  52       nat44_ei_main_t *nm = &nat44_ei_main;                                   \
  53       if (PREDICT_FALSE (!nm->enabled))                                       \
  54         return;                                                               \
  55     }                                                                         \
  56   while (0)
  57
  58 #define fail_if_enabled()                                                     \
  59   do                                                                          \
  60     {                                                                         \
  61       nat44_ei_main_t *nm = &nat44_ei_main;                                   \
  62       if (PREDICT_FALSE (nm->enabled))                                        \
  63         {                                                                     \
  64           nat44_ei_log_err ("plugin enabled");                                \
  65           return 1;                                                           \
  66         }                                                                     \
  67     }                                                                         \
  68   while (0)
  69
  70 #define fail_if_disabled()                                                    \
  71   do                                                                          \
  72     {                                                                         \
  73       nat44_ei_main_t *nm = &nat44_ei_main;                                   \
  74       if (PREDICT_FALSE (!nm->enabled))                                       \
  75         {                                                                     \
  76           nat44_ei_log_err ("plugin disabled");                               \
  77           return 1;                                                           \
  78         }                                                                     \
  79     }                                                                         \
  80   while (0)
  81
  82 /* Hook up input features */
  83 VNET_FEATURE_INIT (ip4_nat_classify, static) = {
  84   .arc_name = "ip4-unicast",
  85   .node_name = "nat44-ei-classify",
  86   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
  87                                "ip4-sv-reassembly-feature"),
  88 };
  89 VNET_FEATURE_INIT (ip4_nat_handoff_classify, static) = {
  90   .arc_name = "ip4-unicast",
  91   .node_name = "nat44-ei-handoff-classify",
  92   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
  93                                "ip4-sv-reassembly-feature"),
  94 };
  95 VNET_FEATURE_INIT (ip4_nat44_ei_in2out, static) = {
  96   .arc_name = "ip4-unicast",
  97   .node_name = "nat44-ei-in2out",
  98   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
  99                                "ip4-sv-reassembly-feature"),
 100 };
 101 VNET_FEATURE_INIT (ip4_nat44_ei_out2in, static) = {
 102   .arc_name = "ip4-unicast",
 103   .node_name = "nat44-ei-out2in",
 104   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 105                                "ip4-sv-reassembly-feature",
 106                                "ip4-dhcp-client-detect"),
 107 };
 108 VNET_FEATURE_INIT (ip4_nat44_ei_in2out_output, static) = {
 109   .arc_name = "ip4-output",
 110   .node_name = "nat44-ei-in2out-output",
 111   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa",
 112                                "ip4-sv-reassembly-output-feature"),
 113 };
 114 VNET_FEATURE_INIT (ip4_nat44_ei_in2out_fast, static) = {
 115   .arc_name = "ip4-unicast",
 116   .node_name = "nat44-ei-in2out-fast",
 117   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 118                                "ip4-sv-reassembly-feature"),
 119 };
 120 VNET_FEATURE_INIT (ip4_nat44_ei_out2in_fast, static) = {
 121   .arc_name = "ip4-unicast",
 122   .node_name = "nat44-ei-out2in-fast",
 123   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 124                                "ip4-sv-reassembly-feature",
 125                                "ip4-dhcp-client-detect"),
 126 };
 127 VNET_FEATURE_INIT (ip4_nat44_ei_hairpin_dst, static) = {
 128   .arc_name = "ip4-unicast",
 129   .node_name = "nat44-ei-hairpin-dst",
 130   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 131                                "ip4-sv-reassembly-feature"),
 132 };
 133 VNET_FEATURE_INIT (ip4_nat44_ei_hairpin_src, static) = {
 134   .arc_name = "ip4-output",
 135   .node_name = "nat44-ei-hairpin-src",
 136   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa",
 137                                "ip4-sv-reassembly-output-feature"),
 138 };
 139 VNET_FEATURE_INIT (ip4_nat44_ei_hairpinning, static) = {
 140   .arc_name = "ip4-local",
 141   .node_name = "nat44-ei-hairpinning",
 142   .runs_before = VNET_FEATURES ("ip4-local-end-of-arc"),
 143 };
 144 VNET_FEATURE_INIT (ip4_nat44_ei_in2out_worker_handoff, static) = {
 145   .arc_name = "ip4-unicast",
 146   .node_name = "nat44-ei-in2out-worker-handoff",
 147   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"),
 148 };
 149 VNET_FEATURE_INIT (ip4_nat44_ei_out2in_worker_handoff, static) = {
 150   .arc_name = "ip4-unicast",
 151   .node_name = "nat44-ei-out2in-worker-handoff",
 152   .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa",
 153                                "ip4-dhcp-client-detect"),
 154 };
 155 VNET_FEATURE_INIT (ip4_nat44_ei_in2out_output_worker_handoff, static) = {
 156   .arc_name = "ip4-output",
 157   .node_name = "nat44-ei-in2out-output-worker-handoff",
 158   .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa",
 159                                "ip4-sv-reassembly-output-feature"),
 160 };
 161
 162 VLIB_PLUGIN_REGISTER () = {
 163   .version = VPP_BUILD_VER,
 164   .description = "IPv4 Endpoint-Independent NAT (NAT44 EI)",
 165 };
 166
 167 #define foreach_nat44_ei_classify_error                                       \
 168   _ (NEXT_IN2OUT, "next in2out")                                              \
 169   _ (NEXT_OUT2IN, "next out2in")                                              \
 170   _ (FRAG_CACHED, "fragment cached")
 171
 172 typedef enum
 173 {
 174 #define _(sym, str) NAT44_EI_CLASSIFY_ERROR_##sym,
 175   foreach_nat44_ei_classify_error
 176 #undef _
 177     NAT44_EI_CLASSIFY_N_ERROR,
 178 } nat44_ei_classify_error_t;
 179
 180 static char *nat44_ei_classify_error_strings[] = {
 181 #define _(sym, string) string,
 182   foreach_nat44_ei_classify_error
 183 #undef _
 184 };
 185
 186 typedef enum
 187 {
 188   NAT44_EI_CLASSIFY_NEXT_IN2OUT,
 189   NAT44_EI_CLASSIFY_NEXT_OUT2IN,
 190   NAT44_EI_CLASSIFY_NEXT_DROP,
 191   NAT44_EI_CLASSIFY_N_NEXT,
 192 } nat44_ei_classify_next_t;
 193
 194 typedef struct
 195 {
 196   u8 next_in2out;
 197   u8 cached;
 198 } nat44_ei_classify_trace_t;
 199
 200 void nat44_ei_add_del_addr_to_fib (ip4_address_t *addr, u8 p_len,
 201                                    u32 sw_if_index, int is_add);
 202
 203 static u8 *
 204 format_nat44_ei_classify_trace (u8 *s, va_list *args)
 205 {
 206   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 207   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 208   nat44_ei_classify_trace_t *t = va_arg (*args, nat44_ei_classify_trace_t *);
 209   char *next;
 210
 211   if (t->cached)
 212     s = format (s, "nat44-ei-classify: fragment cached");
 213   else
 214     {
 215       next = t->next_in2out ? "nat44-ei-in2out" : "nat44-ei-out2in";
 216       s = format (s, "nat44-ei-classify: next %s", next);
 217     }
 218
 219   return s;
 220 }
 221
 222 static void nat44_ei_db_free ();
 223
 224 static void nat44_ei_db_init (u32 translations, u32 translation_buckets,
 225                               u32 user_buckets);
 226
 227 static void nat44_ei_ip4_add_del_interface_address_cb (
 228   ip4_main_t *im, uword opaque, u32 sw_if_index, ip4_address_t *address,
 229   u32 address_length, u32 if_address_index, u32 is_delete);
 230
 231 static void nat44_ei_ip4_add_del_addr_only_sm_cb (
 232   ip4_main_t *im, uword opaque, u32 sw_if_index, ip4_address_t *address,
 233   u32 address_length, u32 if_address_index, u32 is_delete);
 234
 235 static void nat44_ei_update_outside_fib (ip4_main_t *im, uword opaque,
 236                                          u32 sw_if_index, u32 new_fib_index,
 237                                          u32 old_fib_index);
 238
 239 void
 240 nat44_ei_set_node_indexes (nat44_ei_main_t *nm, vlib_main_t *vm)
 241 {
 242   vlib_node_t *node;
 243   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ei-out2in");
 244   nm->out2in_node_index = node->index;
 245   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ei-in2out");
 246   nm->in2out_node_index = node->index;
 247   node = vlib_get_node_by_name (vm, (u8 *) "nat44-ei-in2out-output");
 248   nm->in2out_output_node_index = node->index;
 249 }
 250
 251 int
 252 nat44_ei_set_workers (uword *bitmap)
 253 {
 254   nat44_ei_main_t *nm = &nat44_ei_main;
 255   int i, j = 0;
 256
 257   if (nm->num_workers < 2)
 258     return VNET_API_ERROR_FEATURE_DISABLED;
 259
 260   if (clib_bitmap_last_set (bitmap) >= nm->num_workers)
 261     return VNET_API_ERROR_INVALID_WORKER;
 262
 263   vec_free (nm->workers);
 264   clib_bitmap_foreach (i, bitmap)
 265     {
 266       vec_add1 (nm->workers, i);
 267       nm->per_thread_data[nm->first_worker_index + i].snat_thread_index = j;
 268       nm->per_thread_data[nm->first_worker_index + i].thread_index = i;
 269       j++;
 270     }
 271
 272   nm->port_per_thread = (0xffff - 1024) / _vec_len (nm->workers);
 273
 274   return 0;
 275 }
 276
 277 #define nat_validate_simple_counter(c, i)                                     \
 278   do                                                                          \
 279     {                                                                         \
 280       vlib_validate_simple_counter (&c, i);                                   \
 281       vlib_zero_simple_counter (&c, i);                                       \
 282     }                                                                         \
 283   while (0);
 284
 285 #define nat_init_simple_counter(c, n, sn)                                     \
 286   do                                                                          \
 287     {                                                                         \
 288       c.name = n;                                                             \
 289       c.stat_segment_name = sn;                                               \
 290       nat_validate_simple_counter (c, 0);                                     \
 291     }                                                                         \
 292   while (0);
 293
 294 static_always_inline void
 295 nat_validate_interface_counters (nat44_ei_main_t *nm, u32 sw_if_index)
 296 {
 297 #define _(x)                                                                  \
 298   nat_validate_simple_counter (nm->counters.fastpath.in2out.x, sw_if_index);  \
 299   nat_validate_simple_counter (nm->counters.fastpath.out2in.x, sw_if_index);  \
 300   nat_validate_simple_counter (nm->counters.slowpath.in2out.x, sw_if_index);  \
 301   nat_validate_simple_counter (nm->counters.slowpath.out2in.x, sw_if_index);
 302   foreach_nat_counter;
 303 #undef _
 304   nat_validate_simple_counter (nm->counters.hairpinning, sw_if_index);
 305 }
 306
 307 clib_error_t *
 308 nat44_ei_init (vlib_main_t *vm)
 309 {
 310   nat44_ei_main_t *nm = &nat44_ei_main;
 311   vlib_thread_main_t *tm = vlib_get_thread_main ();
 312   vlib_thread_registration_t *tr;
 313   ip4_add_del_interface_address_callback_t cbi = { 0 };
 314   ip4_table_bind_callback_t cbt = { 0 };
 315   u32 i, num_threads = 0;
 316   uword *p, *bitmap = 0;
 317
 318   clib_memset (nm, 0, sizeof (*nm));
 319
 320   // required
 321   nm->vnet_main = vnet_get_main ();
 322   // convenience
 323   nm->ip4_main = &ip4_main;
 324   nm->api_main = vlibapi_get_main ();
 325   nm->ip4_lookup_main = &ip4_main.lookup_main;
 326
 327   // handoff stuff
 328   nm->fq_out2in_index = ~0;
 329   nm->fq_in2out_index = ~0;
 330   nm->fq_in2out_output_index = ~0;
 331
 332   nm->log_level = NAT_LOG_ERROR;
 333
 334   nat44_ei_set_node_indexes (nm, vm);
 335   nm->log_class = vlib_log_register_class ("nat44-ei", 0);
 336
 337   nat_init_simple_counter (nm->total_users, "total-users",
 338                            "/nat44-ei/total-users");
 339   nat_init_simple_counter (nm->total_sessions, "total-sessions",
 340                            "/nat44-ei/total-sessions");
 341   nat_init_simple_counter (nm->user_limit_reached, "user-limit-reached",
 342                            "/nat44-ei/user-limit-reached");
 343
 344 #define _(x)                                                                  \
 345   nat_init_simple_counter (nm->counters.fastpath.in2out.x, #x,                \
 346                            "/nat44-ei/in2out/fastpath/" #x);                  \
 347   nat_init_simple_counter (nm->counters.fastpath.out2in.x, #x,                \
 348                            "/nat44-ei/out2in/fastpath/" #x);                  \
 349   nat_init_simple_counter (nm->counters.slowpath.in2out.x, #x,                \
 350                            "/nat44-ei/in2out/slowpath/" #x);                  \
 351   nat_init_simple_counter (nm->counters.slowpath.out2in.x, #x,                \
 352                            "/nat44-ei/out2in/slowpath/" #x);
 353   foreach_nat_counter;
 354 #undef _
 355   nat_init_simple_counter (nm->counters.hairpinning, "hairpinning",
 356                            "/nat44-ei/hairpinning");
 357
 358   p = hash_get_mem (tm->thread_registrations_by_name, "workers");
 359   if (p)
 360     {
 361       tr = (vlib_thread_registration_t *) p[0];
 362       if (tr)
 363         {
 364           nm->num_workers = tr->count;
 365           nm->first_worker_index = tr->first_index;
 366         }
 367     }
 368   num_threads = tm->n_vlib_mains - 1;
 369   nm->port_per_thread = 0xffff - 1024;
 370   vec_validate (nm->per_thread_data, num_threads);
 371
 372   /* Use all available workers by default */
 373   if (nm->num_workers > 1)
 374     {
 375
 376       for (i = 0; i < nm->num_workers; i++)
 377         bitmap = clib_bitmap_set (bitmap, i, 1);
 378       nat44_ei_set_workers (bitmap);
 379       clib_bitmap_free (bitmap);
 380     }
 381   else
 382     nm->per_thread_data[0].snat_thread_index = 0;
 383
 384   /* callbacks to call when interface address changes. */
 385   cbi.function = nat44_ei_ip4_add_del_interface_address_cb;
 386   vec_add1 (nm->ip4_main->add_del_interface_address_callbacks, cbi);
 387   cbi.function = nat44_ei_ip4_add_del_addr_only_sm_cb;
 388   vec_add1 (nm->ip4_main->add_del_interface_address_callbacks, cbi);
 389
 390   /* callbacks to call when interface to table biding changes */
 391   cbt.function = nat44_ei_update_outside_fib;
 392   vec_add1 (nm->ip4_main->table_bind_callbacks, cbt);
 393
 394   nm->fib_src_low = fib_source_allocate (
 395     "nat44-ei-low", FIB_SOURCE_PRIORITY_LOW, FIB_SOURCE_BH_SIMPLE);
 396   nm->fib_src_hi = fib_source_allocate ("nat44-ei-hi", FIB_SOURCE_PRIORITY_HI,
 397                                         FIB_SOURCE_BH_SIMPLE);
 398
 399   // used only by out2in-dpo feature
 400   nat_dpo_module_init ();
 401   nat_ha_init (vm, nm->num_workers, num_threads);
 402
 403   nm->hairpinning_fq_index =
 404     vlib_frame_queue_main_init (nat44_ei_hairpinning_node.index, 0);
 405   nm->hairpin_dst_fq_index =
 406     vlib_frame_queue_main_init (nat44_ei_hairpin_dst_node.index, 0);
 407   nm->in2out_hairpinning_finish_ip4_lookup_node_fq_index =
 408     vlib_frame_queue_main_init (
 409       nat44_ei_in2out_hairpinning_finish_ip4_lookup_node.index, 0);
 410   nm->in2out_hairpinning_finish_interface_output_node_fq_index =
 411     vlib_frame_queue_main_init (
 412       nat44_ei_in2out_hairpinning_finish_interface_output_node.index, 0);
 413   return nat44_ei_api_hookup (vm);
 414 }
 415
 416 VLIB_INIT_FUNCTION (nat44_ei_init);
 417
 418 int
 419 nat44_ei_plugin_enable (nat44_ei_config_t c)
 420 {
 421   nat44_ei_main_t *nm = &nat44_ei_main;
 422
 423   fail_if_enabled ();
 424
 425   if (!c.users)
 426     c.users = 1024;
 427
 428   if (!c.sessions)
 429     c.sessions = 10 * 1024;
 430
 431   nm->rconfig = c;
 432
 433   if (!nm->frame_queue_nelts)
 434     nm->frame_queue_nelts = NAT_FQ_NELTS_DEFAULT;
 435
 436   nm->translations = c.sessions;
 437   nm->translation_buckets = nat_calc_bihash_buckets (c.sessions);
 438   nm->user_buckets = nat_calc_bihash_buckets (c.users);
 439
 440   nm->pat = (!c.static_mapping_only ||
 441              (c.static_mapping_only && c.connection_tracking));
 442
 443   nm->static_mapping_only = c.static_mapping_only;
 444   nm->static_mapping_connection_tracking = c.connection_tracking;
 445   nm->out2in_dpo = c.out2in_dpo;
 446   nm->forwarding_enabled = 0;
 447   nm->mss_clamping = 0;
 448
 449   nm->max_users_per_thread = c.users;
 450   nm->max_translations_per_thread = c.sessions;
 451   nm->max_translations_per_user =
 452     c.user_sessions ? c.user_sessions : nm->max_translations_per_thread;
 453
 454   nm->inside_vrf_id = c.inside_vrf;
 455   nm->inside_fib_index = fib_table_find_or_create_and_lock (
 456     FIB_PROTOCOL_IP4, c.inside_vrf, nm->fib_src_hi);
 457
 458   nm->outside_vrf_id = c.outside_vrf;
 459   nm->outside_fib_index = fib_table_find_or_create_and_lock (
 460     FIB_PROTOCOL_IP4, c.outside_vrf, nm->fib_src_hi);
 461
 462   nat_reset_timeouts (&nm->timeouts);
 463   nat44_ei_db_init (nm->translations, nm->translation_buckets,
 464                     nm->user_buckets);
 465   nat44_ei_set_alloc_default ();
 466
 467   // TODO: zero simple counter for all counters missing
 468
 469   vlib_zero_simple_counter (&nm->total_users, 0);
 470   vlib_zero_simple_counter (&nm->total_sessions, 0);
 471   vlib_zero_simple_counter (&nm->user_limit_reached, 0);
 472
 473   nat_ha_enable ();
 474   nm->enabled = 1;
 475
 476   return 0;
 477 }
 478
 479 void
 480 nat44_ei_addresses_free (nat44_ei_address_t **addresses)
 481 {
 482   nat44_ei_address_t *ap;
 483   vec_foreach (ap, *addresses)
 484     {
 485 #define _(N, i, n, s) vec_free (ap->busy_##n##_ports_per_thread);
 486       foreach_nat_protocol
 487 #undef _
 488     }
 489   vec_free (*addresses);
 490   *addresses = 0;
 491 }
 492
 493 int
 494 nat44_ei_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del)
 495 {
 496   const char *feature_name, *del_feature_name;
 497   nat44_ei_main_t *nm = &nat44_ei_main;
 498   nat44_ei_interface_t *i;
 499   nat44_ei_address_t *ap;
 500   nat44_ei_static_mapping_t *m;
 501   nat44_ei_outside_fib_t *outside_fib;
 502   u32 fib_index =
 503     fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index);
 504
 505   fail_if_disabled ();
 506
 507   if (nm->out2in_dpo && !is_inside)
 508     {
 509       nat44_ei_log_err ("error unsupported");
 510       return VNET_API_ERROR_UNSUPPORTED;
 511     }
 512
 513   pool_foreach (i, nm->output_feature_interfaces)
 514     {
 515       if (i->sw_if_index == sw_if_index)
 516         {
 517           nat44_ei_log_err ("error interface already configured");
 518           return VNET_API_ERROR_VALUE_EXIST;
 519         }
 520     }
 521
 522   if (nm->static_mapping_only && !(nm->static_mapping_connection_tracking))
 523     feature_name = is_inside ? "nat44-ei-in2out-fast" : "nat44-ei-out2in-fast";
 524   else
 525     {
 526       if (nm->num_workers > 1)
 527         feature_name = is_inside ? "nat44-ei-in2out-worker-handoff" :
 528                                    "nat44-ei-out2in-worker-handoff";
 529       else
 530         feature_name = is_inside ? "nat44-ei-in2out" : "nat44-ei-out2in";
 531     }
 532
 533   if (nm->fq_in2out_index == ~0 && nm->num_workers > 1)
 534     nm->fq_in2out_index = vlib_frame_queue_main_init (nm->in2out_node_index,
 535                                                       nm->frame_queue_nelts);
 536
 537   if (nm->fq_out2in_index == ~0 && nm->num_workers > 1)
 538     nm->fq_out2in_index = vlib_frame_queue_main_init (nm->out2in_node_index,
 539                                                       nm->frame_queue_nelts);
 540
 541   if (!is_inside)
 542     {
 543       vec_foreach (outside_fib, nm->outside_fibs)
 544         {
 545           if (outside_fib->fib_index == fib_index)
 546             {
 547               if (is_del)
 548                 {
 549                   outside_fib->refcount--;
 550                   if (!outside_fib->refcount)
 551                     vec_del1 (nm->outside_fibs,
 552                               outside_fib - nm->outside_fibs);
 553                 }
 554               else
 555                 outside_fib->refcount++;
 556               goto feature_set;
 557             }
 558         }
 559       if (!is_del)
 560         {
 561           vec_add2 (nm->outside_fibs, outside_fib, 1);
 562           outside_fib->refcount = 1;
 563           outside_fib->fib_index = fib_index;
 564         }
 565     }
 566
 567 feature_set:
 568   pool_foreach (i, nm->interfaces)
 569     {
 570       if (i->sw_if_index == sw_if_index)
 571         {
 572           if (is_del)
 573             {
 574               if (nat44_ei_interface_is_inside (i) &&
 575                   nat44_ei_interface_is_outside (i))
 576                 {
 577                   if (is_inside)
 578                     i->flags &= ~NAT44_EI_INTERFACE_FLAG_IS_INSIDE;
 579                   else
 580                     i->flags &= ~NAT44_EI_INTERFACE_FLAG_IS_OUTSIDE;
 581
 582                   if (nm->num_workers > 1)
 583                     {
 584                       del_feature_name = "nat44-ei-handoff-classify";
 585                       clib_warning (
 586                         "del_feature_name = nat44-ei-handoff-classify");
 587                       feature_name = !is_inside ?
 588                                        "nat44-ei-in2out-worker-handoff" :
 589                                        "nat44-ei-out2in-worker-handoff";
 590                     }
 591                   else
 592                     {
 593                       del_feature_name = "nat44-ei-classify";
 594                       clib_warning ("del_feature_name = nat44-ei-classify");
 595                       feature_name =
 596                         !is_inside ? "nat44-ei-in2out" : "nat44-ei-out2in";
 597                     }
 598
 599                   int rv =
 600                     ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 0);
 601                   if (rv)
 602                     return rv;
 603                   rv = vnet_feature_enable_disable (
 604                     "ip4-unicast", del_feature_name, sw_if_index, 0, 0, 0);
 605                   if (rv)
 606                     return rv;
 607                   rv = vnet_feature_enable_disable (
 608                     "ip4-unicast", feature_name, sw_if_index, 1, 0, 0);
 609                   if (rv)
 610                     return rv;
 611                   if (!is_inside)
 612                     {
 613                       rv = vnet_feature_enable_disable ("ip4-local",
 614                                                         "nat44-ei-hairpinning",
 615                                                         sw_if_index, 1, 0, 0);
 616                       if (rv)
 617                         return rv;
 618                     }
 619                 }
 620               else
 621                 {
 622                   int rv =
 623                     ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 0);
 624                   if (rv)
 625                     return rv;
 626                   rv = vnet_feature_enable_disable (
 627                     "ip4-unicast", feature_name, sw_if_index, 0, 0, 0);
 628                   if (rv)
 629                     return rv;
 630                   pool_put (nm->interfaces, i);
 631                   if (is_inside)
 632                     {
 633                       rv = vnet_feature_enable_disable ("ip4-local",
 634                                                         "nat44-ei-hairpinning",
 635                                                         sw_if_index, 0, 0, 0);
 636                       if (rv)
 637                         return rv;
 638                     }
 639                 }
 640             }
 641           else
 642             {
 643               if ((nat44_ei_interface_is_inside (i) && is_inside) ||
 644                   (nat44_ei_interface_is_outside (i) && !is_inside))
 645                 return 0;
 646
 647               if (nm->num_workers > 1)
 648                 {
 649                   del_feature_name = !is_inside ?
 650                                        "nat44-ei-in2out-worker-handoff" :
 651                                        "nat44-ei-out2in-worker-handoff";
 652                   feature_name = "nat44-ei-handoff-classify";
 653                   clib_warning ("feature_name = nat44-ei-handoff-classify");
 654                 }
 655               else
 656                 {
 657                   del_feature_name =
 658                     !is_inside ? "nat44-ei-in2out" : "nat44-ei-out2in";
 659                   feature_name = "nat44-ei-classify";
 660                   clib_warning ("feature_name = nat44-ei-classify");
 661                 }
 662
 663               int rv =
 664                 ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 1);
 665               if (rv)
 666                 return rv;
 667               rv = vnet_feature_enable_disable (
 668                 "ip4-unicast", del_feature_name, sw_if_index, 0, 0, 0);
 669               if (rv)
 670                 return rv;
 671               rv = vnet_feature_enable_disable ("ip4-unicast", feature_name,
 672                                                 sw_if_index, 1, 0, 0);
 673               if (rv)
 674                 return rv;
 675               if (!is_inside)
 676                 {
 677                   rv = vnet_feature_enable_disable (
 678                     "ip4-local", "nat44-ei-hairpinning", sw_if_index, 0, 0, 0);
 679                   if (rv)
 680                     return rv;
 681                 }
 682               goto set_flags;
 683             }
 684
 685           goto fib;
 686         }
 687     }
 688
 689   if (is_del)
 690     {
 691       nat44_ei_log_err ("error interface couldn't be found");
 692       return VNET_API_ERROR_NO_SUCH_ENTRY;
 693     }
 694
 695   pool_get (nm->interfaces, i);
 696   i->sw_if_index = sw_if_index;
 697   i->flags = 0;
 698   nat_validate_interface_counters (nm, sw_if_index);
 699
 700   int rv = vnet_feature_enable_disable ("ip4-unicast", feature_name,
 701                                         sw_if_index, 1, 0, 0);
 702   if (rv)
 703     return rv;
 704
 705   rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 1);
 706   if (rv)
 707     return rv;
 708
 709   if (is_inside && !nm->out2in_dpo)
 710     {
 711       rv = vnet_feature_enable_disable ("ip4-local", "nat44-ei-hairpinning",
 712                                         sw_if_index, 1, 0, 0);
 713       if (rv)
 714         return rv;
 715     }
 716
 717 set_flags:
 718   if (is_inside)
 719     {
 720       i->flags |= NAT44_EI_INTERFACE_FLAG_IS_INSIDE;
 721       return 0;
 722     }
 723   else
 724     i->flags |= NAT44_EI_INTERFACE_FLAG_IS_OUTSIDE;
 725
 726   /* Add/delete external addresses to FIB */
 727 fib:
 728   vec_foreach (ap, nm->addresses)
 729     nat44_ei_add_del_addr_to_fib (&ap->addr, 32, sw_if_index, !is_del);
 730
 731   pool_foreach (m, nm->static_mappings)
 732     {
 733       if (!(nat44_ei_is_addr_only_static_mapping (m)) ||
 734           (m->local_addr.as_u32 == m->external_addr.as_u32))
 735         continue;
 736
 737       nat44_ei_add_del_addr_to_fib (&m->external_addr, 32, sw_if_index,
 738                                     !is_del);
 739     }
 740
 741   return 0;
 742 }
 743
 744 int
 745 nat44_ei_interface_add_del_output_feature (u32 sw_if_index, u8 is_inside,
 746                                            int is_del)
 747 {
 748   nat44_ei_main_t *nm = &nat44_ei_main;
 749   nat44_ei_interface_t *i;
 750   nat44_ei_address_t *ap;
 751   nat44_ei_static_mapping_t *m;
 752   nat44_ei_outside_fib_t *outside_fib;
 753   u32 fib_index =
 754     fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index);
 755
 756   fail_if_disabled ();
 757
 758   if (nm->static_mapping_only && !(nm->static_mapping_connection_tracking))
 759     {
 760       nat44_ei_log_err ("error unsupported");
 761       return VNET_API_ERROR_UNSUPPORTED;
 762     }
 763
 764   pool_foreach (i, nm->interfaces)
 765     {
 766       if (i->sw_if_index == sw_if_index)
 767         {
 768           nat44_ei_log_err ("error interface already configured");
 769           return VNET_API_ERROR_VALUE_EXIST;
 770         }
 771     }
 772
 773   if (!is_inside)
 774     {
 775       vec_foreach (outside_fib, nm->outside_fibs)
 776         {
 777           if (outside_fib->fib_index == fib_index)
 778             {
 779               if (is_del)
 780                 {
 781                   outside_fib->refcount--;
 782                   if (!outside_fib->refcount)
 783                     vec_del1 (nm->outside_fibs,
 784                               outside_fib - nm->outside_fibs);
 785                 }
 786               else
 787                 outside_fib->refcount++;
 788               goto feature_set;
 789             }
 790         }
 791       if (!is_del)
 792         {
 793           vec_add2 (nm->outside_fibs, outside_fib, 1);
 794           outside_fib->refcount = 1;
 795           outside_fib->fib_index = fib_index;
 796         }
 797     }
 798
 799 feature_set:
 800   if (is_inside)
 801     {
 802       int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, !is_del);
 803       if (rv)
 804         return rv;
 805       rv =
 806         ip4_sv_reass_output_enable_disable_with_refcnt (sw_if_index, !is_del);
 807       if (rv)
 808         return rv;
 809       rv = vnet_feature_enable_disable ("ip4-unicast", "nat44-ei-hairpin-dst",
 810                                         sw_if_index, !is_del, 0, 0);
 811       if (rv)
 812         return rv;
 813       rv = vnet_feature_enable_disable ("ip4-output", "nat44-ei-hairpin-src",
 814                                         sw_if_index, !is_del, 0, 0);
 815       if (rv)
 816         return rv;
 817       goto fq;
 818     }
 819
 820   if (nm->num_workers > 1)
 821     {
 822       int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, !is_del);
 823       if (rv)
 824         return rv;
 825       rv =
 826         ip4_sv_reass_output_enable_disable_with_refcnt (sw_if_index, !is_del);
 827       if (rv)
 828         return rv;
 829       rv = vnet_feature_enable_disable ("ip4-unicast",
 830                                         "nat44-ei-out2in-worker-handoff",
 831                                         sw_if_index, !is_del, 0, 0);
 832       if (rv)
 833         return rv;
 834       rv = vnet_feature_enable_disable (
 835         "ip4-output", "nat44-ei-in2out-output-worker-handoff", sw_if_index,
 836         !is_del, 0, 0);
 837       if (rv)
 838         return rv;
 839     }
 840   else
 841     {
 842       int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, !is_del);
 843       if (rv)
 844         return rv;
 845       rv =
 846         ip4_sv_reass_output_enable_disable_with_refcnt (sw_if_index, !is_del);
 847       if (rv)
 848         return rv;
 849       rv = vnet_feature_enable_disable ("ip4-unicast", "nat44-ei-out2in",
 850                                         sw_if_index, !is_del, 0, 0);
 851       if (rv)
 852         return rv;
 853       rv = vnet_feature_enable_disable ("ip4-output", "nat44-ei-in2out-output",
 854                                         sw_if_index, !is_del, 0, 0);
 855       if (rv)
 856         return rv;
 857     }
 858
 859 fq:
 860   if (nm->fq_in2out_output_index == ~0 && nm->num_workers > 1)
 861     nm->fq_in2out_output_index =
 862       vlib_frame_queue_main_init (nm->in2out_output_node_index, 0);
 863
 864   if (nm->fq_out2in_index == ~0 && nm->num_workers > 1)
 865     nm->fq_out2in_index =
 866       vlib_frame_queue_main_init (nm->out2in_node_index, 0);
 867
 868   pool_foreach (i, nm->output_feature_interfaces)
 869     {
 870       if (i->sw_if_index == sw_if_index)
 871         {
 872           if (is_del)
 873             pool_put (nm->output_feature_interfaces, i);
 874           else
 875             return VNET_API_ERROR_VALUE_EXIST;
 876
 877           goto fib;
 878         }
 879     }
 880
 881   if (is_del)
 882     {
 883       nat44_ei_log_err ("error interface couldn't be found");
 884       return VNET_API_ERROR_NO_SUCH_ENTRY;
 885     }
 886
 887   pool_get (nm->output_feature_interfaces, i);
 888   i->sw_if_index = sw_if_index;
 889   i->flags = 0;
 890   nat_validate_interface_counters (nm, sw_if_index);
 891   if (is_inside)
 892     i->flags |= NAT44_EI_INTERFACE_FLAG_IS_INSIDE;
 893   else
 894     i->flags |= NAT44_EI_INTERFACE_FLAG_IS_OUTSIDE;
 895
 896   /* Add/delete external addresses to FIB */
 897 fib:
 898   if (is_inside)
 899     return 0;
 900
 901   vec_foreach (ap, nm->addresses)
 902     nat44_ei_add_del_addr_to_fib (&ap->addr, 32, sw_if_index, !is_del);
 903
 904   pool_foreach (m, nm->static_mappings)
 905     {
 906       if (!((nat44_ei_is_addr_only_static_mapping (m))) ||
 907           (m->local_addr.as_u32 == m->external_addr.as_u32))
 908         continue;
 909
 910       nat44_ei_add_del_addr_to_fib (&m->external_addr, 32, sw_if_index,
 911                                     !is_del);
 912     }
 913
 914   return 0;
 915 }
 916
 917 int
 918 nat44_ei_plugin_disable ()
 919 {
 920   nat44_ei_main_t *nm = &nat44_ei_main;
 921   nat44_ei_interface_t *i, *vec;
 922   int error = 0;
 923
 924   // first unregister all nodes from interfaces
 925   vec = vec_dup (nm->interfaces);
 926   vec_foreach (i, vec)
 927     {
 928       if (nat44_ei_interface_is_inside (i))
 929         error = nat44_ei_interface_add_del (i->sw_if_index, 1, 1);
 930       if (nat44_ei_interface_is_outside (i))
 931         error = nat44_ei_interface_add_del (i->sw_if_index, 0, 1);
 932
 933       if (error)
 934         {
 935           nat44_ei_log_err ("error occurred while removing interface %u",
 936                             i->sw_if_index);
 937         }
 938     }
 939   vec_free (vec);
 940   nm->interfaces = 0;
 941
 942   vec = vec_dup (nm->output_feature_interfaces);
 943   vec_foreach (i, vec)
 944     {
 945       if (nat44_ei_interface_is_inside (i))
 946         error =
 947           nat44_ei_interface_add_del_output_feature (i->sw_if_index, 1, 1);
 948       if (nat44_ei_interface_is_outside (i))
 949         error =
 950           nat44_ei_interface_add_del_output_feature (i->sw_if_index, 0, 1);
 951
 952       if (error)
 953         {
 954           nat44_ei_log_err ("error occurred while removing interface %u",
 955                             i->sw_if_index);
 956         }
 957     }
 958   vec_free (vec);
 959   nm->output_feature_interfaces = 0;
 960
 961   nat_ha_disable ();
 962   nat44_ei_db_free ();
 963
 964   nat44_ei_addresses_free (&nm->addresses);
 965
 966   vec_free (nm->to_resolve);
 967   vec_free (nm->auto_add_sw_if_indices);
 968
 969   nm->to_resolve = 0;
 970   nm->auto_add_sw_if_indices = 0;
 971
 972   nm->forwarding_enabled = 0;
 973
 974   nm->enabled = 0;
 975   clib_memset (&nm->rconfig, 0, sizeof (nm->rconfig));
 976
 977   return error;
 978 }
 979
 980 int
 981 nat44_ei_set_outside_address_and_port (nat44_ei_address_t *addresses,
 982                                        u32 thread_index, ip4_address_t addr,
 983                                        u16 port, nat_protocol_t protocol)
 984 {
 985   nat44_ei_main_t *nm = &nat44_ei_main;
 986   nat44_ei_address_t *a = 0;
 987   u32 address_index;
 988   u16 port_host_byte_order = clib_net_to_host_u16 (port);
 989
 990   for (address_index = 0; address_index < vec_len (addresses); address_index++)
 991     {
 992       if (addresses[address_index].addr.as_u32 != addr.as_u32)
 993         continue;
 994
 995       a = addresses + address_index;
 996       switch (protocol)
 997         {
 998 #define _(N, j, n, s)                                                         \
 999   case NAT_PROTOCOL_##N:                                                      \
1000     if (a->busy_##n##_port_refcounts[port_host_byte_order])                   \
1001       return VNET_API_ERROR_INSTANCE_IN_USE;                                  \
1002     ++a->busy_##n##_port_refcounts[port_host_byte_order];                     \
1003     a->busy_##n##_ports_per_thread[thread_index]++;                           \
1004     a->busy_##n##_ports++;                                                    \
1005     return 0;
1006           foreach_nat_protocol
1007 #undef _
1008             default : nat_elog_info (nm, "unknown protocol");
1009           return 1;
1010         }
1011     }
1012
1013   return VNET_API_ERROR_NO_SUCH_ENTRY;
1014 }
1015
1016 void
1017 nat44_ei_add_del_address_dpo (ip4_address_t addr, u8 is_add)
1018 {
1019   nat44_ei_main_t *nm = &nat44_ei_main;
1020   dpo_id_t dpo_v4 = DPO_INVALID;
1021   fib_prefix_t pfx = {
1022     .fp_proto = FIB_PROTOCOL_IP4,
1023     .fp_len = 32,
1024     .fp_addr.ip4.as_u32 = addr.as_u32,
1025   };
1026
1027   if (is_add)
1028     {
1029       nat_dpo_create (DPO_PROTO_IP4, 0, &dpo_v4);
1030       fib_table_entry_special_dpo_add (0, &pfx, nm->fib_src_hi,
1031                                        FIB_ENTRY_FLAG_EXCLUSIVE, &dpo_v4);
1032       dpo_reset (&dpo_v4);
1033     }
1034   else
1035     {
1036       fib_table_entry_special_remove (0, &pfx, nm->fib_src_hi);
1037     }
1038 }
1039
1040 void
1041 nat44_ei_free_outside_address_and_port (nat44_ei_address_t *addresses,
1042                                         u32 thread_index, ip4_address_t *addr,
1043                                         u16 port, nat_protocol_t protocol)
1044 {
1045   nat44_ei_main_t *nm = &nat44_ei_main;
1046   nat44_ei_address_t *a;
1047   u32 address_index;
1048   u16 port_host_byte_order = clib_net_to_host_u16 (port);
1049
1050   for (address_index = 0; address_index < vec_len (addresses); address_index++)
1051     {
1052       if (addresses[address_index].addr.as_u32 == addr->as_u32)
1053         break;
1054     }
1055
1056   ASSERT (address_index < vec_len (addresses));
1057
1058   a = addresses + address_index;
1059
1060   switch (protocol)
1061     {
1062 #define _(N, i, n, s)                                                         \
1063   case NAT_PROTOCOL_##N:                                                      \
1064     ASSERT (a->busy_##n##_port_refcounts[port_host_byte_order] >= 1);         \
1065     --a->busy_##n##_port_refcounts[port_host_byte_order];                     \
1066     a->busy_##n##_ports--;                                                    \
1067     a->busy_##n##_ports_per_thread[thread_index]--;                           \
1068     break;
1069       foreach_nat_protocol
1070 #undef _
1071         default : nat_elog_info (nm, "unknown protocol");
1072       return;
1073     }
1074 }
1075
1076 void
1077 nat44_ei_free_session_data_v2 (nat44_ei_main_t *nm, nat44_ei_session_t *s,
1078                                u32 thread_index, u8 is_ha)
1079 {
1080   clib_bihash_kv_8_8_t kv;
1081
1082   /* session lookup tables */
1083   init_nat_i2o_k (&kv, s);
1084   if (clib_bihash_add_del_8_8 (&nm->in2out, &kv, 0))
1085     nat_elog_warn (nm, "in2out key del failed");
1086   init_nat_o2i_k (&kv, s);
1087   if (clib_bihash_add_del_8_8 (&nm->out2in, &kv, 0))
1088     nat_elog_warn (nm, "out2in key del failed");
1089
1090   if (!is_ha)
1091     nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
1092                              &s->in2out.addr, s->in2out.port, &s->out2in.addr,
1093                              s->out2in.port, s->nat_proto);
1094
1095   if (nat44_ei_is_unk_proto_session (s))
1096     return;
1097
1098   if (!is_ha)
1099     {
1100       /* log NAT event */
1101       nat_ipfix_logging_nat44_ses_delete (
1102         thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32,
1103         s->nat_proto, s->in2out.port, s->out2in.port, s->in2out.fib_index);
1104
1105       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
1106                    s->ext_host_port, s->nat_proto, s->out2in.fib_index,
1107                    thread_index);
1108     }
1109
1110   if (nat44_ei_is_session_static (s))
1111     return;
1112
1113   nat44_ei_free_outside_address_and_port (nm->addresses, thread_index,
1114                                           &s->out2in.addr, s->out2in.port,
1115                                           s->nat_proto);
1116 }
1117
1118 nat44_ei_user_t *
1119 nat44_ei_user_get_or_create (nat44_ei_main_t *nm, ip4_address_t *addr,
1120                              u32 fib_index, u32 thread_index)
1121 {
1122   nat44_ei_user_t *u = 0;
1123   nat44_ei_user_key_t user_key;
1124   clib_bihash_kv_8_8_t kv, value;
1125   nat44_ei_main_per_thread_data_t *tnm = &nm->per_thread_data[thread_index];
1126   dlist_elt_t *per_user_list_head_elt;
1127
1128   user_key.addr.as_u32 = addr->as_u32;
1129   user_key.fib_index = fib_index;
1130   kv.key = user_key.as_u64;
1131
1132   /* Ever heard of the "user" = src ip4 address before? */
1133   if (clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1134     {
1135       if (pool_elts (tnm->users) >= nm->max_users_per_thread)
1136         {
1137           vlib_increment_simple_counter (&nm->user_limit_reached, thread_index,
1138                                          0, 1);
1139           nat_elog_warn (nm, "maximum user limit reached");
1140           return NULL;
1141         }
1142       /* no, make a new one */
1143       pool_get (tnm->users, u);
1144       clib_memset (u, 0, sizeof (*u));
1145
1146       u->addr.as_u32 = addr->as_u32;
1147       u->fib_index = fib_index;
1148
1149       pool_get (tnm->list_pool, per_user_list_head_elt);
1150
1151       u->sessions_per_user_list_head_index =
1152         per_user_list_head_elt - tnm->list_pool;
1153
1154       clib_dlist_init (tnm->list_pool, u->sessions_per_user_list_head_index);
1155
1156       kv.value = u - tnm->users;
1157
1158       /* add user */
1159       if (clib_bihash_add_del_8_8 (&tnm->user_hash, &kv, 1))
1160         {
1161           nat_elog_warn (nm, "user_hash key add failed");
1162           nat44_ei_delete_user_with_no_session (nm, u, thread_index);
1163           return NULL;
1164         }
1165
1166       vlib_set_simple_counter (&nm->total_users, thread_index, 0,
1167                                pool_elts (tnm->users));
1168     }
1169   else
1170     {
1171       u = pool_elt_at_index (tnm->users, value.value);
1172     }
1173
1174   return u;
1175 }
1176
1177 nat44_ei_session_t *
1178 nat44_ei_session_alloc_or_recycle (nat44_ei_main_t *nm, nat44_ei_user_t *u,
1179                                    u32 thread_index, f64 now)
1180 {
1181   nat44_ei_session_t *s;
1182   nat44_ei_main_per_thread_data_t *tnm = &nm->per_thread_data[thread_index];
1183   u32 oldest_per_user_translation_list_index, session_index;
1184   dlist_elt_t *oldest_per_user_translation_list_elt;
1185   dlist_elt_t *per_user_translation_list_elt;
1186
1187   /* Over quota? Recycle the least recently used translation */
1188   if ((u->nsessions + u->nstaticsessions) >= nm->max_translations_per_user)
1189     {
1190       oldest_per_user_translation_list_index = clib_dlist_remove_head (
1191         tnm->list_pool, u->sessions_per_user_list_head_index);
1192
1193       ASSERT (oldest_per_user_translation_list_index != ~0);
1194
1195       /* Add it back to the end of the LRU list */
1196       clib_dlist_addtail (tnm->list_pool, u->sessions_per_user_list_head_index,
1197                           oldest_per_user_translation_list_index);
1198       /* Get the list element */
1199       oldest_per_user_translation_list_elt = pool_elt_at_index (
1200         tnm->list_pool, oldest_per_user_translation_list_index);
1201
1202       /* Get the session index from the list element */
1203       session_index = oldest_per_user_translation_list_elt->value;
1204
1205       /* Get the session */
1206       s = pool_elt_at_index (tnm->sessions, session_index);
1207
1208       nat44_ei_free_session_data_v2 (nm, s, thread_index, 0);
1209       if (nat44_ei_is_session_static (s))
1210         u->nstaticsessions--;
1211       else
1212         u->nsessions--;
1213       s->flags = 0;
1214       s->total_bytes = 0;
1215       s->total_pkts = 0;
1216       s->state = 0;
1217       s->ext_host_addr.as_u32 = 0;
1218       s->ext_host_port = 0;
1219       s->ext_host_nat_addr.as_u32 = 0;
1220       s->ext_host_nat_port = 0;
1221     }
1222   else
1223     {
1224       pool_get (tnm->sessions, s);
1225       clib_memset (s, 0, sizeof (*s));
1226
1227       /* Create list elts */
1228       pool_get (tnm->list_pool, per_user_translation_list_elt);
1229       clib_dlist_init (tnm->list_pool,
1230                        per_user_translation_list_elt - tnm->list_pool);
1231
1232       per_user_translation_list_elt->value = s - tnm->sessions;
1233       s->per_user_index = per_user_translation_list_elt - tnm->list_pool;
1234       s->per_user_list_head_index = u->sessions_per_user_list_head_index;
1235
1236       clib_dlist_addtail (tnm->list_pool, s->per_user_list_head_index,
1237                           per_user_translation_list_elt - tnm->list_pool);
1238
1239       s->user_index = u - tnm->users;
1240       vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
1241                                pool_elts (tnm->sessions));
1242     }
1243
1244   s->ha_last_refreshed = now;
1245
1246   return s;
1247 }
1248
1249 void
1250 nat44_ei_free_session_data (nat44_ei_main_t *nm, nat44_ei_session_t *s,
1251                             u32 thread_index, u8 is_ha)
1252 {
1253   clib_bihash_kv_8_8_t kv;
1254
1255   init_nat_i2o_k (&kv, s);
1256   if (clib_bihash_add_del_8_8 (&nm->in2out, &kv, 0))
1257     nat_elog_warn (nm, "in2out key del failed");
1258
1259   init_nat_o2i_k (&kv, s);
1260   if (clib_bihash_add_del_8_8 (&nm->out2in, &kv, 0))
1261     nat_elog_warn (nm, "out2in key del failed");
1262
1263   if (!is_ha)
1264     {
1265       nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
1266                                &s->in2out.addr, s->in2out.port,
1267                                &s->out2in.addr, s->out2in.port, s->nat_proto);
1268
1269       nat_ipfix_logging_nat44_ses_delete (
1270         thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32,
1271         s->nat_proto, s->in2out.port, s->out2in.port, s->in2out.fib_index);
1272
1273       nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
1274                    s->ext_host_port, s->nat_proto, s->out2in.fib_index,
1275                    thread_index);
1276     }
1277
1278   if (nat44_ei_is_session_static (s))
1279     return;
1280
1281   nat44_ei_free_outside_address_and_port (nm->addresses, thread_index,
1282                                           &s->out2in.addr, s->out2in.port,
1283                                           s->nat_proto);
1284 }
1285
1286 static_always_inline void
1287 nat44_ei_user_del_sessions (nat44_ei_user_t *u, u32 thread_index)
1288 {
1289   dlist_elt_t *elt;
1290   nat44_ei_session_t *s;
1291
1292   nat44_ei_main_t *nm = &nat44_ei_main;
1293   nat44_ei_main_per_thread_data_t *tnm = &nm->per_thread_data[thread_index];
1294
1295   // get head
1296   elt =
1297     pool_elt_at_index (tnm->list_pool, u->sessions_per_user_list_head_index);
1298   // get first element
1299   elt = pool_elt_at_index (tnm->list_pool, elt->next);
1300
1301   while (elt->value != ~0)
1302     {
1303       s = pool_elt_at_index (tnm->sessions, elt->value);
1304       elt = pool_elt_at_index (tnm->list_pool, elt->next);
1305
1306       nat44_ei_free_session_data (nm, s, thread_index, 0);
1307       nat44_ei_delete_session (nm, s, thread_index);
1308     }
1309 }
1310
1311 int
1312 nat44_ei_user_del (ip4_address_t *addr, u32 fib_index)
1313 {
1314   int rv = 1;
1315
1316   nat44_ei_main_t *nm = &nat44_ei_main;
1317   nat44_ei_main_per_thread_data_t *tnm;
1318
1319   nat44_ei_user_key_t user_key;
1320   clib_bihash_kv_8_8_t kv, value;
1321
1322   user_key.addr.as_u32 = addr->as_u32;
1323   user_key.fib_index = fib_index;
1324   kv.key = user_key.as_u64;
1325
1326   if (nm->num_workers > 1)
1327     {
1328       vec_foreach (tnm, nm->per_thread_data)
1329         {
1330           if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1331             {
1332               nat44_ei_user_del_sessions (
1333                 pool_elt_at_index (tnm->users, value.value),
1334                 tnm->thread_index);
1335               rv = 0;
1336               break;
1337             }
1338         }
1339     }
1340   else
1341     {
1342       tnm = vec_elt_at_index (nm->per_thread_data, nm->num_workers);
1343       if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1344         {
1345           nat44_ei_user_del_sessions (
1346             pool_elt_at_index (tnm->users, value.value), tnm->thread_index);
1347           rv = 0;
1348         }
1349     }
1350   return rv;
1351 }
1352
1353 void
1354 nat44_ei_static_mapping_del_sessions (nat44_ei_main_t *nm,
1355                                       nat44_ei_main_per_thread_data_t *tnm,
1356                                       nat44_ei_user_key_t u_key, int addr_only,
1357                                       ip4_address_t e_addr, u16 e_port)
1358 {
1359   clib_bihash_kv_8_8_t kv, value;
1360   kv.key = u_key.as_u64;
1361   u64 user_index;
1362   dlist_elt_t *head, *elt;
1363   nat44_ei_user_t *u;
1364   nat44_ei_session_t *s;
1365   u32 elt_index, head_index, ses_index;
1366
1367   if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1368     {
1369       user_index = value.value;
1370       u = pool_elt_at_index (tnm->users, user_index);
1371       if (u->nstaticsessions)
1372         {
1373           head_index = u->sessions_per_user_list_head_index;
1374           head = pool_elt_at_index (tnm->list_pool, head_index);
1375           elt_index = head->next;
1376           elt = pool_elt_at_index (tnm->list_pool, elt_index);
1377           ses_index = elt->value;
1378           while (ses_index != ~0)
1379             {
1380               s = pool_elt_at_index (tnm->sessions, ses_index);
1381               elt = pool_elt_at_index (tnm->list_pool, elt->next);
1382               ses_index = elt->value;
1383
1384               if (!addr_only)
1385                 {
1386                   if ((s->out2in.addr.as_u32 != e_addr.as_u32) ||
1387                       (s->out2in.port != e_port))
1388                     continue;
1389                 }
1390
1391               if (!nat44_ei_is_session_static (s))
1392                 continue;
1393
1394               nat44_ei_free_session_data_v2 (nm, s, tnm - nm->per_thread_data,
1395                                              0);
1396               nat44_ei_delete_session (nm, s, tnm - nm->per_thread_data);
1397
1398               if (!addr_only)
1399                 break;
1400             }
1401         }
1402     }
1403 }
1404
1405 u32
1406 nat44_ei_get_in2out_worker_index (ip4_header_t *ip0, u32 rx_fib_index0,
1407                                   u8 is_output)
1408 {
1409   nat44_ei_main_t *nm = &nat44_ei_main;
1410   u32 next_worker_index = 0;
1411   u32 hash;
1412
1413   next_worker_index = nm->first_worker_index;
1414   hash = ip0->src_address.as_u32 + (ip0->src_address.as_u32 >> 8) +
1415          (ip0->src_address.as_u32 >> 16) + (ip0->src_address.as_u32 >> 24);
1416
1417   if (PREDICT_TRUE (is_pow2 (_vec_len (nm->workers))))
1418     next_worker_index += nm->workers[hash & (_vec_len (nm->workers) - 1)];
1419   else
1420     next_worker_index += nm->workers[hash % _vec_len (nm->workers)];
1421
1422   return next_worker_index;
1423 }
1424
1425 u32
1426 nat44_ei_get_out2in_worker_index (vlib_buffer_t *b, ip4_header_t *ip0,
1427                                   u32 rx_fib_index0, u8 is_output)
1428 {
1429   nat44_ei_main_t *nm = &nat44_ei_main;
1430   udp_header_t *udp;
1431   u16 port;
1432   clib_bihash_kv_8_8_t kv, value;
1433   nat44_ei_static_mapping_t *m;
1434   u32 proto;
1435   u32 next_worker_index = 0;
1436
1437   /* first try static mappings without port */
1438   if (PREDICT_FALSE (pool_elts (nm->static_mappings)))
1439     {
1440       init_nat_k (&kv, ip0->dst_address, 0, rx_fib_index0, 0);
1441       if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv,
1442                                    &value))
1443         {
1444           m = pool_elt_at_index (nm->static_mappings, value.value);
1445           return m->workers[0];
1446         }
1447     }
1448
1449   proto = ip_proto_to_nat_proto (ip0->protocol);
1450   udp = ip4_next_header (ip0);
1451   port = vnet_buffer (b)->ip.reass.l4_dst_port;
1452
1453   /* unknown protocol */
1454   if (PREDICT_FALSE (proto == NAT_PROTOCOL_OTHER))
1455     {
1456       /* use current thread */
1457       return vlib_get_thread_index ();
1458     }
1459
1460   if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_ICMP))
1461     {
1462       icmp46_header_t *icmp = (icmp46_header_t *) udp;
1463       icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1);
1464       if (!icmp_type_is_error_message (
1465             vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
1466         port = vnet_buffer (b)->ip.reass.l4_src_port;
1467       else
1468         {
1469           /* if error message, then it's not fragmented and we can access it */
1470           ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1);
1471           proto = ip_proto_to_nat_proto (inner_ip->protocol);
1472           void *l4_header = ip4_next_header (inner_ip);
1473           switch (proto)
1474             {
1475             case NAT_PROTOCOL_ICMP:
1476               icmp = (icmp46_header_t *) l4_header;
1477               echo = (icmp_echo_header_t *) (icmp + 1);
1478               port = echo->identifier;
1479               break;
1480             case NAT_PROTOCOL_UDP:
1481             case NAT_PROTOCOL_TCP:
1482               port = ((tcp_udp_header_t *) l4_header)->src_port;
1483               break;
1484             default:
1485               return vlib_get_thread_index ();
1486             }
1487         }
1488     }
1489
1490   /* try static mappings with port */
1491   if (PREDICT_FALSE (pool_elts (nm->static_mappings)))
1492     {
1493       init_nat_k (&kv, ip0->dst_address, port, rx_fib_index0, proto);
1494       if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv,
1495                                    &value))
1496         {
1497           m = pool_elt_at_index (nm->static_mappings, value.value);
1498           return m->workers[0];
1499         }
1500     }
1501
1502   /* worker by outside port */
1503   next_worker_index = nm->first_worker_index;
1504   next_worker_index +=
1505     nm->workers[(clib_net_to_host_u16 (port) - 1024) / nm->port_per_thread];
1506   return next_worker_index;
1507 }
1508
1509 static int
1510 nat44_ei_alloc_default_cb (nat44_ei_address_t *addresses, u32 fib_index,
1511                            u32 thread_index, nat_protocol_t proto,
1512                            ip4_address_t s_addr, ip4_address_t *addr,
1513                            u16 *port, u16 port_per_thread,
1514                            u32 snat_thread_index)
1515 {
1516   nat44_ei_main_t *nm = &nat44_ei_main;
1517   nat44_ei_address_t *a, *ga = 0;
1518   u32 portnum;
1519   int i;
1520
1521   if (vec_len (addresses) > 0)
1522     {
1523
1524       int s_addr_offset = s_addr.as_u32 % vec_len (addresses);
1525
1526       for (i = s_addr_offset; i < vec_len (addresses); ++i)
1527         {
1528           a = addresses + i;
1529           switch (proto)
1530             {
1531 #define _(N, j, n, s)                                                         \
1532   case NAT_PROTOCOL_##N:                                                      \
1533     if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread)       \
1534       {                                                                       \
1535         if (a->fib_index == fib_index)                                        \
1536           {                                                                   \
1537             while (1)                                                         \
1538               {                                                               \
1539                 portnum = (port_per_thread * snat_thread_index) +             \
1540                           nat_random_port (&nm->random_seed, 0,               \
1541                                            port_per_thread - 1) +             \
1542                           1024;                                               \
1543                 if (a->busy_##n##_port_refcounts[portnum])                    \
1544                   continue;                                                   \
1545                 --a->busy_##n##_port_refcounts[portnum];                      \
1546                 a->busy_##n##_ports_per_thread[thread_index]++;               \
1547                 a->busy_##n##_ports++;                                        \
1548                 *addr = a->addr;                                              \
1549                 *port = clib_host_to_net_u16 (portnum);                       \
1550                 return 0;                                                     \
1551               }                                                               \
1552           }                                                                   \
1553         else if (a->fib_index == ~0)                                          \
1554           {                                                                   \
1555             ga = a;                                                           \
1556           }                                                                   \
1557       }                                                                       \
1558     break;
1559               foreach_nat_protocol;
1560             default:
1561               nat_elog_info (nm, "unknown protocol");
1562               return 1;
1563             }
1564         }
1565
1566       for (i = 0; i < s_addr_offset; ++i)
1567         {
1568           a = addresses + i;
1569           switch (proto)
1570             {
1571               foreach_nat_protocol;
1572             default:
1573               nat_elog_info (nm, "unknown protocol");
1574               return 1;
1575             }
1576         }
1577   if (ga)
1578     {
1579       a = ga;
1580       // fake fib index to reuse macro
1581       fib_index = ~0;
1582       switch (proto)
1583         {
1584           foreach_nat_protocol;
1585             default : nat_elog_info (nm, "unknown protocol");
1586           return 1;
1587         }
1588     }
1589     }
1590
1591 #undef _
1592
1593   /* Totally out of translations to use... */
1594   nat_ipfix_logging_addresses_exhausted (thread_index, 0);
1595   return 1;
1596 }
1597
1598 static int
1599 nat44_ei_alloc_range_cb (nat44_ei_address_t *addresses, u32 fib_index,
1600                          u32 thread_index, nat_protocol_t proto,
1601                          ip4_address_t s_addr, ip4_address_t *addr, u16 *port,
1602                          u16 port_per_thread, u32 snat_thread_index)
1603 {
1604   nat44_ei_main_t *nm = &nat44_ei_main;
1605   nat44_ei_address_t *a = addresses;
1606   u16 portnum, ports;
1607
1608   ports = nm->end_port - nm->start_port + 1;
1609
1610   if (!vec_len (addresses))
1611     goto exhausted;
1612
1613   switch (proto)
1614     {
1615 #define _(N, i, n, s)                                                         \
1616   case NAT_PROTOCOL_##N:                                                      \
1617     if (a->busy_##n##_ports < ports)                                          \
1618       {                                                                       \
1619         while (1)                                                             \
1620           {                                                                   \
1621             portnum = nat_random_port (&nm->random_seed, nm->start_port,      \
1622                                        nm->end_port);                         \
1623             if (a->busy_##n##_port_refcounts[portnum])                        \
1624               continue;                                                       \
1625             ++a->busy_##n##_port_refcounts[portnum];                          \
1626             a->busy_##n##_ports++;                                            \
1627             *addr = a->addr;                                                  \
1628             *port = clib_host_to_net_u16 (portnum);                           \
1629             return 0;                                                         \
1630           }                                                                   \
1631       }                                                                       \
1632     break;
1633       foreach_nat_protocol
1634 #undef _
1635         default : nat_elog_info (nm, "unknown protocol");
1636       return 1;
1637     }
1638
1639 exhausted:
1640   /* Totally out of translations to use... */
1641   nat_ipfix_logging_addresses_exhausted (thread_index, 0);
1642   return 1;
1643 }
1644
1645 static int
1646 nat44_ei_alloc_mape_cb (nat44_ei_address_t *addresses, u32 fib_index,
1647                         u32 thread_index, nat_protocol_t proto,
1648                         ip4_address_t s_addr, ip4_address_t *addr, u16 *port,
1649                         u16 port_per_thread, u32 snat_thread_index)
1650 {
1651   nat44_ei_main_t *nm = &nat44_ei_main;
1652   nat44_ei_address_t *a = addresses;
1653   u16 m, ports, portnum, A, j;
1654   m = 16 - (nm->psid_offset + nm->psid_length);
1655   ports = (1 << (16 - nm->psid_length)) - (1 << m);
1656
1657   if (!vec_len (addresses))
1658     goto exhausted;
1659
1660   switch (proto)
1661     {
1662 #define _(N, i, n, s)                                                         \
1663   case NAT_PROTOCOL_##N:                                                      \
1664     if (a->busy_##n##_ports < ports)                                          \
1665       {                                                                       \
1666         while (1)                                                             \
1667           {                                                                   \
1668             A = nat_random_port (&nm->random_seed, 1,                         \
1669                                  pow2_mask (nm->psid_offset));                \
1670             j = nat_random_port (&nm->random_seed, 0, pow2_mask (m));         \
1671             portnum = A | (nm->psid << nm->psid_offset) | (j << (16 - m));    \
1672             if (a->busy_##n##_port_refcounts[portnum])                        \
1673               continue;                                                       \
1674             ++a->busy_##n##_port_refcounts[portnum];                          \
1675             a->busy_##n##_ports++;                                            \
1676             *addr = a->addr;                                                  \
1677             *port = clib_host_to_net_u16 (portnum);                           \
1678             return 0;                                                         \
1679           }                                                                   \
1680       }                                                                       \
1681     break;
1682       foreach_nat_protocol
1683 #undef _
1684         default : nat_elog_info (nm, "unknown protocol");
1685       return 1;
1686     }
1687
1688 exhausted:
1689   /* Totally out of translations to use... */
1690   nat_ipfix_logging_addresses_exhausted (thread_index, 0);
1691   return 1;
1692 }
1693
1694 void
1695 nat44_ei_set_alloc_default ()
1696 {
1697   nat44_ei_main_t *nm = &nat44_ei_main;
1698
1699   nm->addr_and_port_alloc_alg = NAT44_EI_ADDR_AND_PORT_ALLOC_ALG_DEFAULT;
1700   nm->alloc_addr_and_port = nat44_ei_alloc_default_cb;
1701 }
1702
1703 void
1704 nat44_ei_set_alloc_range (u16 start_port, u16 end_port)
1705 {
1706   nat44_ei_main_t *nm = &nat44_ei_main;
1707
1708   nm->addr_and_port_alloc_alg = NAT44_EI_ADDR_AND_PORT_ALLOC_ALG_RANGE;
1709   nm->alloc_addr_and_port = nat44_ei_alloc_range_cb;
1710   nm->start_port = start_port;
1711   nm->end_port = end_port;
1712 }
1713
1714 void
1715 nat44_ei_set_alloc_mape (u16 psid, u16 psid_offset, u16 psid_length)
1716 {
1717   nat44_ei_main_t *nm = &nat44_ei_main;
1718
1719   nm->addr_and_port_alloc_alg = NAT44_EI_ADDR_AND_PORT_ALLOC_ALG_MAPE;
1720   nm->alloc_addr_and_port = nat44_ei_alloc_mape_cb;
1721   nm->psid = psid;
1722   nm->psid_offset = psid_offset;
1723   nm->psid_length = psid_length;
1724 }
1725
1726 static void
1727 nat44_ei_add_static_mapping_when_resolved (ip4_address_t l_addr, u16 l_port,
1728                                            u16 e_port, nat_protocol_t proto,
1729                                            u32 sw_if_index, u32 vrf_id,
1730                                            int addr_only, int identity_nat,
1731                                            u8 *tag)
1732 {
1733   nat44_ei_main_t *nm = &nat44_ei_main;
1734   nat44_ei_static_map_resolve_t *rp;
1735
1736   vec_add2 (nm->to_resolve, rp, 1);
1737   clib_memset (rp, 0, sizeof (*rp));
1738
1739   rp->l_addr.as_u32 = l_addr.as_u32;
1740   rp->l_port = l_port;
1741   rp->e_port = e_port;
1742   rp->sw_if_index = sw_if_index;
1743   rp->vrf_id = vrf_id;
1744   rp->proto = proto;
1745   rp->addr_only = addr_only;
1746   rp->identity_nat = identity_nat;
1747   rp->tag = vec_dup (tag);
1748 }
1749
1750 void
1751 nat44_ei_delete_session (nat44_ei_main_t *nm, nat44_ei_session_t *ses,
1752                          u32 thread_index)
1753 {
1754   nat44_ei_main_per_thread_data_t *tnm =
1755     vec_elt_at_index (nm->per_thread_data, thread_index);
1756   clib_bihash_kv_8_8_t kv, value;
1757   nat44_ei_user_t *u;
1758   const nat44_ei_user_key_t u_key = { .addr = ses->in2out.addr,
1759                                       .fib_index = ses->in2out.fib_index };
1760   const u8 u_static = nat44_ei_is_session_static (ses);
1761
1762   clib_dlist_remove (tnm->list_pool, ses->per_user_index);
1763   pool_put_index (tnm->list_pool, ses->per_user_index);
1764
1765   pool_put (tnm->sessions, ses);
1766   vlib_set_simple_counter (&nm->total_sessions, thread_index, 0,
1767                            pool_elts (tnm->sessions));
1768
1769   kv.key = u_key.as_u64;
1770   if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
1771     {
1772       u = pool_elt_at_index (tnm->users, value.value);
1773       if (u_static)
1774         u->nstaticsessions--;
1775       else
1776         u->nsessions--;
1777
1778       nat44_ei_delete_user_with_no_session (nm, u, thread_index);
1779     }
1780 }
1781
1782 int
1783 nat44_ei_del_session (nat44_ei_main_t *nm, ip4_address_t *addr, u16 port,
1784                       nat_protocol_t proto, u32 vrf_id, int is_in)
1785 {
1786   nat44_ei_main_per_thread_data_t *tnm;
1787   clib_bihash_kv_8_8_t kv, value;
1788   ip4_header_t ip;
1789   u32 fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id);
1790   nat44_ei_session_t *s;
1791   clib_bihash_8_8_t *t;
1792
1793   ip.dst_address.as_u32 = ip.src_address.as_u32 = addr->as_u32;
1794   if (nm->num_workers > 1)
1795     tnm =
1796       vec_elt_at_index (nm->per_thread_data,
1797                         nat44_ei_get_in2out_worker_index (&ip, fib_index, 0));
1798   else
1799     tnm = vec_elt_at_index (nm->per_thread_data, nm->num_workers);
1800
1801   init_nat_k (&kv, *addr, port, fib_index, proto);
1802   t = is_in ? &nm->in2out : &nm->out2in;
1803   if (!clib_bihash_search_8_8 (t, &kv, &value))
1804     {
1805       if (pool_is_free_index (tnm->sessions, value.value))
1806         return VNET_API_ERROR_UNSPECIFIED;
1807
1808       s = pool_elt_at_index (tnm->sessions, value.value);
1809       nat44_ei_free_session_data_v2 (nm, s, tnm - nm->per_thread_data, 0);
1810       nat44_ei_delete_session (nm, s, tnm - nm->per_thread_data);
1811       return 0;
1812     }
1813
1814   return VNET_API_ERROR_NO_SUCH_ENTRY;
1815 }
1816
1817 u32
1818 nat44_ei_get_thread_idx_by_port (u16 e_port)
1819 {
1820   nat44_ei_main_t *nm = &nat44_ei_main;
1821   u32 thread_idx = nm->num_workers;
1822   if (nm->num_workers > 1)
1823     {
1824       thread_idx = nm->first_worker_index +
1825                    nm->workers[(e_port - 1024) / nm->port_per_thread];
1826     }
1827   return thread_idx;
1828 }
1829
1830 void
1831 nat44_ei_add_del_addr_to_fib (ip4_address_t *addr, u8 p_len, u32 sw_if_index,
1832                               int is_add)
1833 {
1834   nat44_ei_main_t *nm = &nat44_ei_main;
1835   fib_prefix_t prefix = {
1836     .fp_len = p_len,
1837     .fp_proto = FIB_PROTOCOL_IP4,
1838     .fp_addr = {
1839                 .ip4.as_u32 = addr->as_u32,
1840                 },
1841   };
1842   u32 fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
1843
1844   if (is_add)
1845     fib_table_entry_update_one_path (
1846       fib_index, &prefix, nm->fib_src_low,
1847       (FIB_ENTRY_FLAG_CONNECTED | FIB_ENTRY_FLAG_LOCAL |
1848        FIB_ENTRY_FLAG_EXCLUSIVE),
1849       DPO_PROTO_IP4, NULL, sw_if_index, ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE);
1850   else
1851     fib_table_entry_delete (fib_index, &prefix, nm->fib_src_low);
1852 }
1853
1854 int
1855 nat44_ei_add_del_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
1856                                  u16 l_port, u16 e_port, nat_protocol_t proto,
1857                                  u32 sw_if_index, u32 vrf_id, u8 addr_only,
1858                                  u8 identity_nat, u8 *tag, u8 is_add)
1859 {
1860   nat44_ei_main_t *nm = &nat44_ei_main;
1861   nat44_ei_static_mapping_t *m = 0;
1862   clib_bihash_kv_8_8_t kv, value;
1863   nat44_ei_address_t *a = 0;
1864   u32 fib_index = ~0;
1865   nat44_ei_interface_t *interface;
1866   nat44_ei_main_per_thread_data_t *tnm;
1867   nat44_ei_user_key_t u_key;
1868   nat44_ei_user_t *u;
1869   dlist_elt_t *head, *elt;
1870   u32 elt_index, head_index;
1871   u32 ses_index;
1872   u64 user_index;
1873   nat44_ei_session_t *s;
1874   nat44_ei_static_map_resolve_t *rp, *rp_match = 0;
1875   nat44_ei_lb_addr_port_t *local;
1876   u32 find = ~0;
1877   int i;
1878
1879   if (sw_if_index != ~0)
1880     {
1881       ip4_address_t *first_int_addr;
1882
1883       for (i = 0; i < vec_len (nm->to_resolve); i++)
1884         {
1885           rp = nm->to_resolve + i;
1886           if (rp->sw_if_index != sw_if_index ||
1887               rp->l_addr.as_u32 != l_addr.as_u32 || rp->vrf_id != vrf_id ||
1888               rp->addr_only != addr_only)
1889             continue;
1890
1891           if (!addr_only)
1892             {
1893               if ((rp->l_port != l_port && rp->e_port != e_port) ||
1894                   rp->proto != proto)
1895                 continue;
1896             }
1897
1898           rp_match = rp;
1899           break;
1900         }
1901
1902       /* Might be already set... */
1903       first_int_addr = ip4_interface_first_address (
1904         nm->ip4_main, sw_if_index, 0 /* just want the address */);
1905
1906       if (is_add)
1907         {
1908           if (rp_match)
1909             return VNET_API_ERROR_VALUE_EXIST;
1910
1911           nat44_ei_add_static_mapping_when_resolved (
1912             l_addr, l_port, e_port, proto, sw_if_index, vrf_id, addr_only,
1913             identity_nat, tag);
1914
1915           /* DHCP resolution required? */
1916           if (!first_int_addr)
1917             return 0;
1918
1919           e_addr.as_u32 = first_int_addr->as_u32;
1920           /* Identity mapping? */
1921           if (l_addr.as_u32 == 0)
1922             l_addr.as_u32 = e_addr.as_u32;
1923         }
1924       else
1925         {
1926           if (!rp_match)
1927             return VNET_API_ERROR_NO_SUCH_ENTRY;
1928
1929           vec_del1 (nm->to_resolve, i);
1930
1931           if (!first_int_addr)
1932             return 0;
1933
1934           e_addr.as_u32 = first_int_addr->as_u32;
1935           /* Identity mapping? */
1936           if (l_addr.as_u32 == 0)
1937             l_addr.as_u32 = e_addr.as_u32;
1938         }
1939     }
1940
1941   init_nat_k (&kv, e_addr, addr_only ? 0 : e_port, 0, addr_only ? 0 : proto);
1942   if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv, &value))
1943     m = pool_elt_at_index (nm->static_mappings, value.value);
1944
1945   if (is_add)
1946     {
1947       if (m)
1948         {
1949           // identity mapping for second vrf
1950           if (nat44_ei_is_identity_static_mapping (m))
1951             {
1952               pool_foreach (local, m->locals)
1953                 {
1954                   if (local->vrf_id == vrf_id)
1955                     return VNET_API_ERROR_VALUE_EXIST;
1956                 }
1957               pool_get (m->locals, local);
1958               local->vrf_id = vrf_id;
1959               local->fib_index = fib_table_find_or_create_and_lock (
1960                 FIB_PROTOCOL_IP4, vrf_id, nm->fib_src_low);
1961               init_nat_kv (&kv, m->local_addr, m->local_port, local->fib_index,
1962                            m->proto, 0, m - nm->static_mappings);
1963               clib_bihash_add_del_8_8 (&nm->static_mapping_by_local, &kv, 1);
1964               return 0;
1965             }
1966           return VNET_API_ERROR_VALUE_EXIST;
1967         }
1968
1969       /* Convert VRF id to FIB index */
1970       if (vrf_id != ~0)
1971         {
1972           fib_index = fib_table_find_or_create_and_lock (
1973             FIB_PROTOCOL_IP4, vrf_id, nm->fib_src_low);
1974         }
1975       /* If not specified use inside VRF id from NAT44 plugin config */
1976       else
1977         {
1978           fib_index = nm->inside_fib_index;
1979           vrf_id = nm->inside_vrf_id;
1980           fib_table_lock (fib_index, FIB_PROTOCOL_IP4, nm->fib_src_low);
1981         }
1982
1983       if (!identity_nat)
1984         {
1985           init_nat_k (&kv, l_addr, addr_only ? 0 : l_port, fib_index,
1986                       addr_only ? 0 : proto);
1987           if (!clib_bihash_search_8_8 (&nm->static_mapping_by_local, &kv,
1988                                        &value))
1989             return VNET_API_ERROR_VALUE_EXIST;
1990         }
1991
1992       /* Find external address in allocated addresses and reserve port for
1993          address and port pair mapping when dynamic translations enabled */
1994       if (!(addr_only || nm->static_mapping_only))
1995         {
1996           for (i = 0; i < vec_len (nm->addresses); i++)
1997             {
1998               if (nm->addresses[i].addr.as_u32 == e_addr.as_u32)
1999                 {
2000                   a = nm->addresses + i;
2001                   /* External port must be unused */
2002                   switch (proto)
2003                     {
2004 #define _(N, j, n, s)                                                         \
2005   case NAT_PROTOCOL_##N:                                                      \
2006     if (a->busy_##n##_port_refcounts[e_port])                                 \
2007       return VNET_API_ERROR_INVALID_VALUE;                                    \
2008     ++a->busy_##n##_port_refcounts[e_port];                                   \
2009     if (e_port > 1024)                                                        \
2010       {                                                                       \
2011         a->busy_##n##_ports++;                                                \
2012         a->busy_##n##_ports_per_thread[nat44_ei_get_thread_idx_by_port (      \
2013           e_port)]++;                                                         \
2014       }                                                                       \
2015     break;
2016                       foreach_nat_protocol
2017 #undef _
2018                         default : nat_elog_info (nm, "unknown protocol");
2019                       return VNET_API_ERROR_INVALID_VALUE_2;
2020                     }
2021                   break;
2022                 }
2023             }
2024           /* External address must be allocated */
2025           if (!a && (l_addr.as_u32 != e_addr.as_u32))
2026             {
2027               if (sw_if_index != ~0)
2028                 {
2029                   for (i = 0; i < vec_len (nm->to_resolve); i++)
2030                     {
2031                       rp = nm->to_resolve + i;
2032                       if (rp->addr_only)
2033                         continue;
2034                       if (rp->sw_if_index != sw_if_index &&
2035                           rp->l_addr.as_u32 != l_addr.as_u32 &&
2036                           rp->vrf_id != vrf_id && rp->l_port != l_port &&
2037                           rp->e_port != e_port && rp->proto != proto)
2038                         continue;
2039
2040                       vec_del1 (nm->to_resolve, i);
2041                       break;
2042                     }
2043                 }
2044               return VNET_API_ERROR_NO_SUCH_ENTRY;
2045             }
2046         }
2047
2048       pool_get (nm->static_mappings, m);
2049       clib_memset (m, 0, sizeof (*m));
2050       m->tag = vec_dup (tag);
2051       m->local_addr = l_addr;
2052       m->external_addr = e_addr;
2053
2054       if (addr_only)
2055         m->flags |= NAT44_EI_STATIC_MAPPING_FLAG_ADDR_ONLY;
2056       else
2057         {
2058           m->local_port = l_port;
2059           m->external_port = e_port;
2060           m->proto = proto;
2061         }
2062
2063       if (identity_nat)
2064         {
2065           m->flags |= NAT44_EI_STATIC_MAPPING_FLAG_IDENTITY_NAT;
2066           pool_get (m->locals, local);
2067           local->vrf_id = vrf_id;
2068           local->fib_index = fib_index;
2069         }
2070       else
2071         {
2072           m->vrf_id = vrf_id;
2073           m->fib_index = fib_index;
2074         }
2075
2076       if (nm->num_workers > 1)
2077         {
2078           ip4_header_t ip = {
2079             .src_address = m->local_addr,
2080           };
2081           vec_add1 (m->workers,
2082                     nat44_ei_get_in2out_worker_index (&ip, m->fib_index, 0));
2083           tnm = vec_elt_at_index (nm->per_thread_data, m->workers[0]);
2084         }
2085       else
2086         tnm = vec_elt_at_index (nm->per_thread_data, nm->num_workers);
2087
2088       init_nat_kv (&kv, m->local_addr, m->local_port, fib_index, m->proto, 0,
2089                    m - nm->static_mappings);
2090       clib_bihash_add_del_8_8 (&nm->static_mapping_by_local, &kv, 1);
2091
2092       init_nat_kv (&kv, m->external_addr, m->external_port, 0, m->proto, 0,
2093                    m - nm->static_mappings);
2094       clib_bihash_add_del_8_8 (&nm->static_mapping_by_external, &kv, 1);
2095
2096       /* Delete dynamic sessions matching local address (+ local port) */
2097       // TODO: based on type of NAT EI/ED
2098       if (!(nm->static_mapping_only))
2099         {
2100           u_key.addr = m->local_addr;
2101           u_key.fib_index = m->fib_index;
2102           kv.key = u_key.as_u64;
2103           if (!clib_bihash_search_8_8 (&tnm->user_hash, &kv, &value))
2104             {
2105               user_index = value.value;
2106               u = pool_elt_at_index (tnm->users, user_index);
2107               if (u->nsessions)
2108                 {
2109                   head_index = u->sessions_per_user_list_head_index;
2110                   head = pool_elt_at_index (tnm->list_pool, head_index);
2111                   elt_index = head->next;
2112                   elt = pool_elt_at_index (tnm->list_pool, elt_index);
2113                   ses_index = elt->value;
2114                   while (ses_index != ~0)
2115                     {
2116                       s = pool_elt_at_index (tnm->sessions, ses_index);
2117                       elt = pool_elt_at_index (tnm->list_pool, elt->next);
2118                       ses_index = elt->value;
2119
2120                       if (nat44_ei_is_session_static (s))
2121                         continue;
2122
2123                       if (!addr_only && s->in2out.port != m->local_port)
2124                         continue;
2125
2126                       nat44_ei_free_session_data_v2 (
2127                         nm, s, tnm - nm->per_thread_data, 0);
2128                       nat44_ei_delete_session (nm, s,
2129                                                tnm - nm->per_thread_data);
2130
2131                       if (!addr_only)
2132                         break;
2133                     }
2134                 }
2135             }
2136         }
2137     }
2138   else
2139     {
2140       if (!m)
2141         {
2142           if (sw_if_index != ~0)
2143             return 0;
2144           else
2145             return VNET_API_ERROR_NO_SUCH_ENTRY;
2146         }
2147
2148       if (identity_nat)
2149         {
2150           if (vrf_id == ~0)
2151             vrf_id = nm->inside_vrf_id;
2152
2153           pool_foreach (local, m->locals)
2154             {
2155               if (local->vrf_id == vrf_id)
2156                 find = local - m->locals;
2157             }
2158           if (find == ~0)
2159             return VNET_API_ERROR_NO_SUCH_ENTRY;
2160
2161           local = pool_elt_at_index (m->locals, find);
2162           fib_index = local->fib_index;
2163           pool_put (m->locals, local);
2164         }
2165       else
2166         fib_index = m->fib_index;
2167
2168       /* Free external address port */
2169       if (!(addr_only || nm->static_mapping_only))
2170         {
2171           for (i = 0; i < vec_len (nm->addresses); i++)
2172             {
2173               if (nm->addresses[i].addr.as_u32 == e_addr.as_u32)
2174                 {
2175                   a = nm->addresses + i;
2176                   switch (proto)
2177                     {
2178 #define _(N, j, n, s)                                                         \
2179   case NAT_PROTOCOL_##N:                                                      \
2180     --a->busy_##n##_port_refcounts[e_port];                                   \
2181     if (e_port > 1024)                                                        \
2182       {                                                                       \
2183         a->busy_##n##_ports--;                                                \
2184         a->busy_##n##_ports_per_thread[nat44_ei_get_thread_idx_by_port (      \
2185           e_port)]--;                                                         \
2186       }                                                                       \
2187     break;
2188                       foreach_nat_protocol
2189 #undef _
2190                         default : return VNET_API_ERROR_INVALID_VALUE_2;
2191                     }
2192                   break;
2193                 }
2194             }
2195         }
2196
2197       if (nm->num_workers > 1)
2198         tnm = vec_elt_at_index (nm->per_thread_data, m->workers[0]);
2199       else
2200         tnm = vec_elt_at_index (nm->per_thread_data, nm->num_workers);
2201
2202       init_nat_k (&kv, m->local_addr, m->local_port, fib_index, m->proto);
2203       clib_bihash_add_del_8_8 (&nm->static_mapping_by_local, &kv, 0);
2204
2205       /* Delete session(s) for static mapping if exist */
2206       if (!(nm->static_mapping_only) ||
2207           (nm->static_mapping_only && nm->static_mapping_connection_tracking))
2208         {
2209           u_key.addr = m->local_addr;
2210           u_key.fib_index = fib_index;
2211           kv.key = u_key.as_u64;
2212           nat44_ei_static_mapping_del_sessions (nm, tnm, u_key, addr_only,
2213                                                 e_addr, e_port);
2214         }
2215
2216       fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, nm->fib_src_low);
2217       if (pool_elts (m->locals))
2218         return 0;
2219
2220       init_nat_k (&kv, m->external_addr, m->external_port, 0, m->proto);
2221       clib_bihash_add_del_8_8 (&nm->static_mapping_by_external, &kv, 0);
2222
2223       vec_free (m->tag);
2224       vec_free (m->workers);
2225       /* Delete static mapping from pool */
2226       pool_put (nm->static_mappings, m);
2227     }
2228
2229   if (!addr_only || (l_addr.as_u32 == e_addr.as_u32))
2230     return 0;
2231
2232   /* Add/delete external address to FIB */
2233   pool_foreach (interface, nm->interfaces)
2234     {
2235       if (nat44_ei_interface_is_inside (interface) || nm->out2in_dpo)
2236         continue;
2237
2238       nat44_ei_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index,
2239                                     is_add);
2240       break;
2241     }
2242   pool_foreach (interface, nm->output_feature_interfaces)
2243     {
2244       if (nat44_ei_interface_is_inside (interface) || nm->out2in_dpo)
2245         continue;
2246
2247       nat44_ei_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index,
2248                                     is_add);
2249       break;
2250     }
2251   return 0;
2252 }
2253
2254 int
2255 nat44_ei_static_mapping_match (ip4_address_t match_addr, u16 match_port,
2256                                u32 match_fib_index,
2257                                nat_protocol_t match_protocol,
2258                                ip4_address_t *mapping_addr, u16 *mapping_port,
2259                                u32 *mapping_fib_index, u8 by_external,
2260                                u8 *is_addr_only, u8 *is_identity_nat)
2261 {
2262   nat44_ei_main_t *nm = &nat44_ei_main;
2263   clib_bihash_kv_8_8_t kv, value;
2264   nat44_ei_static_mapping_t *m;
2265   u16 port;
2266
2267   if (by_external)
2268     {
2269       init_nat_k (&kv, match_addr, match_port, 0, match_protocol);
2270       if (clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv,
2271                                   &value))
2272         {
2273           /* Try address only mapping */
2274           init_nat_k (&kv, match_addr, 0, 0, 0);
2275           if (clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv,
2276                                       &value))
2277             return 1;
2278         }
2279       m = pool_elt_at_index (nm->static_mappings, value.value);
2280
2281       *mapping_fib_index = m->fib_index;
2282       *mapping_addr = m->local_addr;
2283       port = m->local_port;
2284     }
2285   else
2286     {
2287       init_nat_k (&kv, match_addr, match_port, match_fib_index,
2288                   match_protocol);
2289       if (clib_bihash_search_8_8 (&nm->static_mapping_by_local, &kv, &value))
2290         {
2291           /* Try address only mapping */
2292           init_nat_k (&kv, match_addr, 0, match_fib_index, 0);
2293           if (clib_bihash_search_8_8 (&nm->static_mapping_by_local, &kv,
2294                                       &value))
2295             return 1;
2296         }
2297       m = pool_elt_at_index (nm->static_mappings, value.value);
2298
2299       *mapping_fib_index = nm->outside_fib_index;
2300       *mapping_addr = m->external_addr;
2301       port = m->external_port;
2302     }
2303
2304   /* Address only mapping doesn't change port */
2305   if (nat44_ei_is_addr_only_static_mapping (m))
2306     *mapping_port = match_port;
2307   else
2308     *mapping_port = port;
2309
2310   if (PREDICT_FALSE (is_addr_only != 0))
2311     *is_addr_only = nat44_ei_is_addr_only_static_mapping (m);
2312
2313   if (PREDICT_FALSE (is_identity_nat != 0))
2314     *is_identity_nat = nat44_ei_is_identity_static_mapping (m);
2315
2316   return 0;
2317 }
2318
2319 static void
2320 nat44_ei_worker_db_free (nat44_ei_main_per_thread_data_t *tnm)
2321 {
2322   pool_free (tnm->list_pool);
2323   pool_free (tnm->lru_pool);
2324   pool_free (tnm->sessions);
2325   pool_free (tnm->users);
2326
2327   clib_bihash_free_8_8 (&tnm->user_hash);
2328 }
2329
2330 u8 *
2331 format_nat44_ei_key (u8 *s, va_list *args)
2332 {
2333   u64 key = va_arg (*args, u64);
2334
2335   ip4_address_t addr;
2336   u16 port;
2337   nat_protocol_t protocol;
2338   u32 fib_index;
2339
2340   split_nat_key (key, &addr, &port, &fib_index, &protocol);
2341
2342   s = format (s, "%U proto %U port %d fib %d", format_ip4_address, &addr,
2343               format_nat_protocol, protocol, clib_net_to_host_u16 (port),
2344               fib_index);
2345   return s;
2346 }
2347
2348 u8 *
2349 format_nat44_ei_user_kvp (u8 *s, va_list *args)
2350 {
2351   clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
2352   nat44_ei_user_key_t k;
2353
2354   k.as_u64 = v->key;
2355
2356   s = format (s, "%U fib %d user-index %llu", format_ip4_address, &k.addr,
2357               k.fib_index, v->value);
2358
2359   return s;
2360 }
2361
2362 u8 *
2363 format_nat44_ei_session_kvp (u8 *s, va_list *args)
2364 {
2365   clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
2366
2367   s = format (s, "%U thread-index %llu session-index %llu",
2368               format_nat44_ei_key, v->key, nat_value_get_thread_index (v),
2369               nat_value_get_session_index (v));
2370
2371   return s;
2372 }
2373
2374 u8 *
2375 format_nat44_ei_static_mapping_kvp (u8 *s, va_list *args)
2376 {
2377   clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *);
2378
2379   s = format (s, "%U static-mapping-index %llu", format_nat44_ei_key, v->key,
2380               v->value);
2381
2382   return s;
2383 }
2384
2385 static void
2386 nat44_ei_worker_db_init (nat44_ei_main_per_thread_data_t *tnm,
2387                          u32 translations, u32 translation_buckets,
2388                          u32 user_buckets)
2389 {
2390   dlist_elt_t *head;
2391
2392   pool_alloc (tnm->list_pool, translations);
2393   pool_alloc (tnm->lru_pool, translations);
2394   pool_alloc (tnm->sessions, translations);
2395
2396   clib_bihash_init_8_8 (&tnm->user_hash, "users", user_buckets, 0);
2397
2398   clib_bihash_set_kvp_format_fn_8_8 (&tnm->user_hash,
2399                                      format_nat44_ei_user_kvp);
2400
2401   pool_get (tnm->lru_pool, head);
2402   tnm->tcp_trans_lru_head_index = head - tnm->lru_pool;
2403   clib_dlist_init (tnm->lru_pool, tnm->tcp_trans_lru_head_index);
2404
2405   pool_get (tnm->lru_pool, head);
2406   tnm->tcp_estab_lru_head_index = head - tnm->lru_pool;
2407   clib_dlist_init (tnm->lru_pool, tnm->tcp_estab_lru_head_index);
2408
2409   pool_get (tnm->lru_pool, head);
2410   tnm->udp_lru_head_index = head - tnm->lru_pool;
2411   clib_dlist_init (tnm->lru_pool, tnm->udp_lru_head_index);
2412
2413   pool_get (tnm->lru_pool, head);
2414   tnm->icmp_lru_head_index = head - tnm->lru_pool;
2415   clib_dlist_init (tnm->lru_pool, tnm->icmp_lru_head_index);
2416
2417   pool_get (tnm->lru_pool, head);
2418   tnm->unk_proto_lru_head_index = head - tnm->lru_pool;
2419   clib_dlist_init (tnm->lru_pool, tnm->unk_proto_lru_head_index);
2420 }
2421
2422 static void
2423 nat44_ei_db_free ()
2424 {
2425   nat44_ei_main_t *nm = &nat44_ei_main;
2426   nat44_ei_main_per_thread_data_t *tnm;
2427
2428   pool_free (nm->static_mappings);
2429   clib_bihash_free_8_8 (&nm->static_mapping_by_local);
2430   clib_bihash_free_8_8 (&nm->static_mapping_by_external);
2431
2432   if (nm->pat)
2433     {
2434       clib_bihash_free_8_8 (&nm->in2out);
2435       clib_bihash_free_8_8 (&nm->out2in);
2436       vec_foreach (tnm, nm->per_thread_data)
2437         {
2438           nat44_ei_worker_db_free (tnm);
2439         }
2440     }
2441 }
2442
2443 static void
2444 nat44_ei_db_init (u32 translations, u32 translation_buckets, u32 user_buckets)
2445 {
2446   nat44_ei_main_t *nm = &nat44_ei_main;
2447   nat44_ei_main_per_thread_data_t *tnm;
2448
2449   u32 static_mapping_buckets = 1024;
2450   u32 static_mapping_memory_size = 64 << 20;
2451
2452   clib_bihash_init_8_8 (&nm->static_mapping_by_local,
2453                         "static_mapping_by_local", static_mapping_buckets,
2454                         static_mapping_memory_size);
2455   clib_bihash_init_8_8 (&nm->static_mapping_by_external,
2456                         "static_mapping_by_external", static_mapping_buckets,
2457                         static_mapping_memory_size);
2458   clib_bihash_set_kvp_format_fn_8_8 (&nm->static_mapping_by_local,
2459                                      format_nat44_ei_static_mapping_kvp);
2460   clib_bihash_set_kvp_format_fn_8_8 (&nm->static_mapping_by_external,
2461                                      format_nat44_ei_static_mapping_kvp);
2462
2463   if (nm->pat)
2464     {
2465       clib_bihash_init_8_8 (&nm->in2out, "in2out", translation_buckets, 0);
2466       clib_bihash_init_8_8 (&nm->out2in, "out2in", translation_buckets, 0);
2467       clib_bihash_set_kvp_format_fn_8_8 (&nm->in2out,
2468                                          format_nat44_ei_session_kvp);
2469       clib_bihash_set_kvp_format_fn_8_8 (&nm->out2in,
2470                                          format_nat44_ei_session_kvp);
2471       vec_foreach (tnm, nm->per_thread_data)
2472         {
2473           nat44_ei_worker_db_init (tnm, translations, translation_buckets,
2474                                    user_buckets);
2475         }
2476     }
2477 }
2478
2479 void
2480 nat44_ei_sessions_clear ()
2481 {
2482   nat44_ei_main_t *nm = &nat44_ei_main;
2483   nat44_ei_main_per_thread_data_t *tnm;
2484
2485   if (nm->pat)
2486     {
2487       clib_bihash_free_8_8 (&nm->in2out);
2488       clib_bihash_free_8_8 (&nm->out2in);
2489       clib_bihash_init_8_8 (&nm->in2out, "in2out", nm->translation_buckets, 0);
2490       clib_bihash_init_8_8 (&nm->out2in, "out2in", nm->translation_buckets, 0);
2491       clib_bihash_set_kvp_format_fn_8_8 (&nm->in2out,
2492                                          format_nat44_ei_session_kvp);
2493       clib_bihash_set_kvp_format_fn_8_8 (&nm->out2in,
2494                                          format_nat44_ei_session_kvp);
2495       vec_foreach (tnm, nm->per_thread_data)
2496         {
2497           nat44_ei_worker_db_free (tnm);
2498           nat44_ei_worker_db_init (tnm, nm->translations,
2499                                    nm->translation_buckets, nm->user_buckets);
2500         }
2501     }
2502
2503   vlib_zero_simple_counter (&nm->total_users, 0);
2504   vlib_zero_simple_counter (&nm->total_sessions, 0);
2505   vlib_zero_simple_counter (&nm->user_limit_reached, 0);
2506 }
2507
2508 static void
2509 nat44_ei_update_outside_fib (ip4_main_t *im, uword opaque, u32 sw_if_index,
2510                              u32 new_fib_index, u32 old_fib_index)
2511 {
2512   nat44_ei_main_t *nm = &nat44_ei_main;
2513   nat44_ei_outside_fib_t *outside_fib;
2514   nat44_ei_interface_t *i;
2515   u8 is_add = 1;
2516   u8 match = 0;
2517
2518   if (!nm->enabled || (new_fib_index == old_fib_index) ||
2519       (!vec_len (nm->outside_fibs)))
2520     {
2521       return;
2522     }
2523
2524   pool_foreach (i, nm->interfaces)
2525     {
2526       if (i->sw_if_index == sw_if_index)
2527         {
2528           if (!(nat44_ei_interface_is_outside (i)))
2529             return;
2530           match = 1;
2531         }
2532     }
2533
2534   pool_foreach (i, nm->output_feature_interfaces)
2535     {
2536       if (i->sw_if_index == sw_if_index)
2537         {
2538           if (!(nat44_ei_interface_is_outside (i)))
2539             return;
2540           match = 1;
2541         }
2542     }
2543
2544   if (!match)
2545     return;
2546
2547   vec_foreach (outside_fib, nm->outside_fibs)
2548     {
2549       if (outside_fib->fib_index == old_fib_index)
2550         {
2551           outside_fib->refcount--;
2552           if (!outside_fib->refcount)
2553             vec_del1 (nm->outside_fibs, outside_fib - nm->outside_fibs);
2554           break;
2555         }
2556     }
2557
2558   vec_foreach (outside_fib, nm->outside_fibs)
2559     {
2560       if (outside_fib->fib_index == new_fib_index)
2561         {
2562           outside_fib->refcount++;
2563           is_add = 0;
2564           break;
2565         }
2566     }
2567
2568   if (is_add)
2569     {
2570       vec_add2 (nm->outside_fibs, outside_fib, 1);
2571       outside_fib->refcount = 1;
2572       outside_fib->fib_index = new_fib_index;
2573     }
2574 }
2575
2576 int
2577 nat44_ei_add_address (nat44_ei_main_t *nm, ip4_address_t *addr, u32 vrf_id)
2578 {
2579   nat44_ei_address_t *ap;
2580   nat44_ei_interface_t *i;
2581   vlib_thread_main_t *tm = vlib_get_thread_main ();
2582
2583   /* Check if address already exists */
2584   vec_foreach (ap, nm->addresses)
2585     {
2586       if (ap->addr.as_u32 == addr->as_u32)
2587         {
2588           nat44_ei_log_err ("address exist");
2589           return VNET_API_ERROR_VALUE_EXIST;
2590         }
2591     }
2592
2593   vec_add2 (nm->addresses, ap, 1);
2594
2595   ap->addr = *addr;
2596   if (vrf_id != ~0)
2597     ap->fib_index = fib_table_find_or_create_and_lock (
2598       FIB_PROTOCOL_IP4, vrf_id, nm->fib_src_low);
2599   else
2600     ap->fib_index = ~0;
2601
2602 #define _(N, i, n, s)                                                         \
2603   clib_memset (ap->busy_##n##_port_refcounts, 0,                              \
2604                sizeof (ap->busy_##n##_port_refcounts));                       \
2605   ap->busy_##n##_ports = 0;                                                   \
2606   ap->busy_##n##_ports_per_thread = 0;                                        \
2607   vec_validate_init_empty (ap->busy_##n##_ports_per_thread,                   \
2608                            tm->n_vlib_mains - 1, 0);
2609   foreach_nat_protocol
2610 #undef _
2611
2612     /* Add external address to FIB */
2613     pool_foreach (i, nm->interfaces)
2614   {
2615     if (nat44_ei_interface_is_inside (i) || nm->out2in_dpo)
2616       continue;
2617
2618     nat44_ei_add_del_addr_to_fib (addr, 32, i->sw_if_index, 1);
2619     break;
2620   }
2621   pool_foreach (i, nm->output_feature_interfaces)
2622     {
2623       if (nat44_ei_interface_is_inside (i) || nm->out2in_dpo)
2624         continue;
2625
2626       nat44_ei_add_del_addr_to_fib (addr, 32, i->sw_if_index, 1);
2627       break;
2628     }
2629
2630   return 0;
2631 }
2632
2633 int
2634 nat44_ei_add_interface_address (nat44_ei_main_t *nm, u32 sw_if_index,
2635                                 int is_del)
2636 {
2637   ip4_main_t *ip4_main = nm->ip4_main;
2638   ip4_address_t *first_int_addr;
2639   nat44_ei_static_map_resolve_t *rp;
2640   u32 *indices_to_delete = 0;
2641   int i, j;
2642   u32 *auto_add_sw_if_indices = nm->auto_add_sw_if_indices;
2643
2644   first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index,
2645                                                 0 /* just want the address */);
2646
2647   for (i = 0; i < vec_len (auto_add_sw_if_indices); i++)
2648     {
2649       if (auto_add_sw_if_indices[i] == sw_if_index)
2650         {
2651           if (is_del)
2652             {
2653               /* if have address remove it */
2654               if (first_int_addr)
2655                 (void) nat44_ei_del_address (nm, first_int_addr[0], 1);
2656               else
2657                 {
2658                   for (j = 0; j < vec_len (nm->to_resolve); j++)
2659                     {
2660                       rp = nm->to_resolve + j;
2661                       if (rp->sw_if_index == sw_if_index)
2662                         vec_add1 (indices_to_delete, j);
2663                     }
2664                   if (vec_len (indices_to_delete))
2665                     {
2666                       for (j = vec_len (indices_to_delete) - 1; j >= 0; j--)
2667                         vec_del1 (nm->to_resolve, j);
2668                       vec_free (indices_to_delete);
2669                     }
2670                 }
2671               vec_del1 (nm->auto_add_sw_if_indices, i);
2672             }
2673           else
2674             return VNET_API_ERROR_VALUE_EXIST;
2675
2676           return 0;
2677         }
2678     }
2679
2680   if (is_del)
2681     return VNET_API_ERROR_NO_SUCH_ENTRY;
2682
2683   /* add to the auto-address list */
2684   vec_add1 (nm->auto_add_sw_if_indices, sw_if_index);
2685
2686   /* If the address is already bound - or static - add it now */
2687   if (first_int_addr)
2688     (void) nat44_ei_add_address (nm, first_int_addr, ~0);
2689
2690   return 0;
2691 }
2692
2693 static int
2694 nat44_ei_is_address_used_in_static_mapping (ip4_address_t addr)
2695 {
2696   nat44_ei_main_t *nm = &nat44_ei_main;
2697   nat44_ei_static_mapping_t *m;
2698   pool_foreach (m, nm->static_mappings)
2699     {
2700       if (nat44_ei_is_addr_only_static_mapping (m) ||
2701           nat44_ei_is_identity_static_mapping (m))
2702         continue;
2703       if (m->external_addr.as_u32 == addr.as_u32)
2704         return 1;
2705     }
2706   return 0;
2707 }
2708
2709 int
2710 nat44_ei_del_address (nat44_ei_main_t *nm, ip4_address_t addr, u8 delete_sm)
2711 {
2712   nat44_ei_address_t *a = 0;
2713   nat44_ei_session_t *ses;
2714   u32 *ses_to_be_removed = 0, *ses_index;
2715   nat44_ei_main_per_thread_data_t *tnm;
2716   nat44_ei_interface_t *interface;
2717   nat44_ei_static_mapping_t *m;
2718   int i;
2719
2720   /* Find SNAT address */
2721   for (i = 0; i < vec_len (nm->addresses); i++)
2722     {
2723       if (nm->addresses[i].addr.as_u32 == addr.as_u32)
2724         {
2725           a = nm->addresses + i;
2726           break;
2727         }
2728     }
2729   if (!a)
2730     {
2731       nat44_ei_log_err ("no such address");
2732       return VNET_API_ERROR_NO_SUCH_ENTRY;
2733     }
2734
2735   if (delete_sm)
2736     {
2737       pool_foreach (m, nm->static_mappings)
2738         {
2739           if (m->external_addr.as_u32 == addr.as_u32)
2740             (void) nat44_ei_add_del_static_mapping (
2741               m->local_addr, m->external_addr, m->local_port, m->external_port,
2742               m->proto, ~0 /* sw_if_index */, m->vrf_id,
2743               nat44_ei_is_addr_only_static_mapping (m),
2744               nat44_ei_is_identity_static_mapping (m), m->tag, 0);
2745         }
2746     }
2747   else
2748     {
2749       /* Check if address is used in some static mapping */
2750       if (nat44_ei_is_address_used_in_static_mapping (addr))
2751         {
2752           nat44_ei_log_err ("address used in static mapping");
2753           return VNET_API_ERROR_UNSPECIFIED;
2754         }
2755     }
2756
2757   if (a->fib_index != ~0)
2758     fib_table_unlock (a->fib_index, FIB_PROTOCOL_IP4, nm->fib_src_low);
2759
2760   /* Delete sessions using address */
2761   if (a->busy_tcp_ports || a->busy_udp_ports || a->busy_icmp_ports)
2762     {
2763       vec_foreach (tnm, nm->per_thread_data)
2764         {
2765           pool_foreach (ses, tnm->sessions)
2766             {
2767               if (ses->out2in.addr.as_u32 == addr.as_u32)
2768                 {
2769                   nat44_ei_free_session_data (nm, ses,
2770                                               tnm - nm->per_thread_data, 0);
2771                   vec_add1 (ses_to_be_removed, ses - tnm->sessions);
2772                 }
2773             }
2774           vec_foreach (ses_index, ses_to_be_removed)
2775             {
2776               ses = pool_elt_at_index (tnm->sessions, ses_index[0]);
2777               nat44_ei_delete_session (nm, ses, tnm - nm->per_thread_data);
2778             }
2779           vec_free (ses_to_be_removed);
2780         }
2781     }
2782
2783 #define _(N, i, n, s) vec_free (a->busy_##n##_ports_per_thread);
2784   foreach_nat_protocol
2785 #undef _
2786     vec_del1 (nm->addresses, i);
2787
2788   /* Delete external address from FIB */
2789   pool_foreach (interface, nm->interfaces)
2790     {
2791       if (nat44_ei_interface_is_inside (interface) || nm->out2in_dpo)
2792         continue;
2793       nat44_ei_add_del_addr_to_fib (&addr, 32, interface->sw_if_index, 0);
2794       break;
2795     }
2796
2797   pool_foreach (interface, nm->output_feature_interfaces)
2798     {
2799       if (nat44_ei_interface_is_inside (interface) || nm->out2in_dpo)
2800         continue;
2801       nat44_ei_add_del_addr_to_fib (&addr, 32, interface->sw_if_index, 0);
2802       break;
2803     }
2804
2805   return 0;
2806 }
2807
2808 static void
2809 nat44_ei_ip4_add_del_interface_address_cb (ip4_main_t *im, uword opaque,
2810                                            u32 sw_if_index,
2811                                            ip4_address_t *address,
2812                                            u32 address_length,
2813                                            u32 if_address_index, u32 is_delete)
2814 {
2815   nat44_ei_main_t *nm = &nat44_ei_main;
2816   nat44_ei_static_map_resolve_t *rp;
2817   ip4_address_t l_addr;
2818   int i, j;
2819   int rv;
2820   nat44_ei_address_t *addresses = nm->addresses;
2821
2822   if (!nm->enabled)
2823     return;
2824
2825   for (i = 0; i < vec_len (nm->auto_add_sw_if_indices); i++)
2826     {
2827       if (sw_if_index == nm->auto_add_sw_if_indices[i])
2828         goto match;
2829     }
2830
2831   return;
2832
2833 match:
2834   if (!is_delete)
2835     {
2836       /* Don't trip over lease renewal, static config */
2837       for (j = 0; j < vec_len (addresses); j++)
2838         if (addresses[j].addr.as_u32 == address->as_u32)
2839           return;
2840
2841       (void) nat44_ei_add_address (nm, address, ~0);
2842       /* Scan static map resolution vector */
2843       for (j = 0; j < vec_len (nm->to_resolve); j++)
2844         {
2845           rp = nm->to_resolve + j;
2846           if (rp->addr_only)
2847             continue;
2848           /* On this interface? */
2849           if (rp->sw_if_index == sw_if_index)
2850             {
2851               /* Indetity mapping? */
2852               if (rp->l_addr.as_u32 == 0)
2853                 l_addr.as_u32 = address[0].as_u32;
2854               else
2855                 l_addr.as_u32 = rp->l_addr.as_u32;
2856               /* Add the static mapping */
2857               rv = nat44_ei_add_del_static_mapping (
2858                 l_addr, address[0], rp->l_port, rp->e_port, rp->proto,
2859                 ~0 /* sw_if_index */, rp->vrf_id, rp->addr_only,
2860                 rp->identity_nat, rp->tag, 1);
2861               if (rv)
2862                 nat_elog_notice_X1 (
2863                   nm, "nat44_ei_add_del_static_mapping returned %d", "i4", rv);
2864             }
2865         }
2866       return;
2867     }
2868   else
2869     {
2870       (void) nat44_ei_del_address (nm, address[0], 1);
2871       return;
2872     }
2873 }
2874
2875 int
2876 nat44_ei_set_frame_queue_nelts (u32 frame_queue_nelts)
2877 {
2878   fail_if_enabled ();
2879   nat44_ei_main_t *nm = &nat44_ei_main;
2880   nm->frame_queue_nelts = frame_queue_nelts;
2881   return 0;
2882 }
2883
2884 static void
2885 nat44_ei_ip4_add_del_addr_only_sm_cb (ip4_main_t *im, uword opaque,
2886                                       u32 sw_if_index, ip4_address_t *address,
2887                                       u32 address_length, u32 if_address_index,
2888                                       u32 is_delete)
2889 {
2890   nat44_ei_main_t *nm = &nat44_ei_main;
2891   nat44_ei_static_map_resolve_t *rp;
2892   nat44_ei_static_mapping_t *m;
2893   clib_bihash_kv_8_8_t kv, value;
2894   int i, rv;
2895   ip4_address_t l_addr;
2896
2897   if (!nm->enabled)
2898     return;
2899
2900   for (i = 0; i < vec_len (nm->to_resolve); i++)
2901     {
2902       rp = nm->to_resolve + i;
2903       if (rp->addr_only == 0)
2904         continue;
2905       if (rp->sw_if_index == sw_if_index)
2906         goto match;
2907     }
2908
2909   return;
2910
2911 match:
2912   init_nat_k (&kv, *address, rp->addr_only ? 0 : rp->e_port,
2913               nm->outside_fib_index, rp->addr_only ? 0 : rp->proto);
2914   if (clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv, &value))
2915     m = 0;
2916   else
2917     m = pool_elt_at_index (nm->static_mappings, value.value);
2918
2919   if (!is_delete)
2920     {
2921       /* Don't trip over lease renewal, static config */
2922       if (m)
2923         return;
2924     }
2925   else
2926     {
2927       if (!m)
2928         return;
2929     }
2930
2931   /* Indetity mapping? */
2932   if (rp->l_addr.as_u32 == 0)
2933     l_addr.as_u32 = address[0].as_u32;
2934   else
2935     l_addr.as_u32 = rp->l_addr.as_u32;
2936   /* Add the static mapping */
2937
2938   rv = nat44_ei_add_del_static_mapping (
2939     l_addr, address[0], rp->l_port, rp->e_port, rp->proto,
2940     ~0 /* sw_if_index */, rp->vrf_id, rp->addr_only, rp->identity_nat, rp->tag,
2941     !is_delete);
2942   if (rv)
2943     nat_elog_notice_X1 (nm, "nat44_ei_add_del_static_mapping returned %d",
2944                         "i4", rv);
2945 }
2946
2947 static_always_inline uword
2948 nat44_ei_classify_inline_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
2949                              vlib_frame_t *frame)
2950 {
2951   u32 n_left_from, *from, *to_next;
2952   nat44_ei_classify_next_t next_index;
2953   nat44_ei_main_t *nm = &nat44_ei_main;
2954   nat44_ei_static_mapping_t *m;
2955   u32 next_in2out = 0, next_out2in = 0;
2956
2957   from = vlib_frame_vector_args (frame);
2958   n_left_from = frame->n_vectors;
2959   next_index = node->cached_next_index;
2960
2961   while (n_left_from > 0)
2962     {
2963       u32 n_left_to_next;
2964
2965       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2966
2967       while (n_left_from > 0 && n_left_to_next > 0)
2968         {
2969           u32 bi0;
2970           vlib_buffer_t *b0;
2971           u32 next0 = NAT44_EI_CLASSIFY_NEXT_IN2OUT;
2972           ip4_header_t *ip0;
2973           nat44_ei_address_t *ap;
2974           clib_bihash_kv_8_8_t kv0, value0;
2975
2976           /* speculatively enqueue b0 to the current next frame */
2977           bi0 = from[0];
2978           to_next[0] = bi0;
2979           from += 1;
2980           to_next += 1;
2981           n_left_from -= 1;
2982           n_left_to_next -= 1;
2983
2984           b0 = vlib_get_buffer (vm, bi0);
2985           ip0 = vlib_buffer_get_current (b0);
2986
2987           vec_foreach (ap, nm->addresses)
2988             {
2989               if (ip0->dst_address.as_u32 == ap->addr.as_u32)
2990                 {
2991                   next0 = NAT44_EI_CLASSIFY_NEXT_OUT2IN;
2992                   goto enqueue0;
2993                 }
2994             }
2995
2996           if (PREDICT_FALSE (pool_elts (nm->static_mappings)))
2997             {
2998               init_nat_k (&kv0, ip0->dst_address, 0, 0, 0);
2999               /* try to classify the fragment based on IP header alone */
3000               if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external,
3001                                            &kv0, &value0))
3002                 {
3003                   m = pool_elt_at_index (nm->static_mappings, value0.value);
3004                   if (m->local_addr.as_u32 != m->external_addr.as_u32)
3005                     next0 = NAT44_EI_CLASSIFY_NEXT_OUT2IN;
3006                   goto enqueue0;
3007                 }
3008               init_nat_k (&kv0, ip0->dst_address,
3009                           vnet_buffer (b0)->ip.reass.l4_dst_port, 0,
3010                           ip_proto_to_nat_proto (ip0->protocol));
3011               if (!clib_bihash_search_8_8 (&nm->static_mapping_by_external,
3012                                            &kv0, &value0))
3013                 {
3014                   m = pool_elt_at_index (nm->static_mappings, value0.value);
3015                   if (m->local_addr.as_u32 != m->external_addr.as_u32)
3016                     next0 = NAT44_EI_CLASSIFY_NEXT_OUT2IN;
3017                 }
3018             }
3019
3020         enqueue0:
3021           if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
3022                              (b0->flags & VLIB_BUFFER_IS_TRACED)))
3023             {
3024               nat44_ei_classify_trace_t *t =
3025                 vlib_add_trace (vm, node, b0, sizeof (*t));
3026               t->cached = 0;
3027               t->next_in2out = next0 == NAT44_EI_CLASSIFY_NEXT_IN2OUT ? 1 : 0;
3028             }
3029
3030           next_in2out += next0 == NAT44_EI_CLASSIFY_NEXT_IN2OUT;
3031           next_out2in += next0 == NAT44_EI_CLASSIFY_NEXT_OUT2IN;
3032
3033           /* verify speculative enqueue, maybe switch current next frame */
3034           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
3035                                            n_left_to_next, bi0, next0);
3036         }
3037
3038       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
3039     }
3040
3041   vlib_node_increment_counter (
3042     vm, node->node_index, NAT44_EI_CLASSIFY_ERROR_NEXT_IN2OUT, next_in2out);
3043   vlib_node_increment_counter (
3044     vm, node->node_index, NAT44_EI_CLASSIFY_ERROR_NEXT_OUT2IN, next_out2in);
3045   return frame->n_vectors;
3046 }
3047
3048 VLIB_NODE_FN (nat44_ei_classify_node)
3049 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
3050 {
3051   return nat44_ei_classify_inline_fn (vm, node, frame);
3052 }
3053
3054 VLIB_REGISTER_NODE (nat44_ei_classify_node) = {
3055   .name = "nat44-ei-classify",
3056   .vector_size = sizeof (u32),
3057   .format_trace = format_nat44_ei_classify_trace,
3058   .type = VLIB_NODE_TYPE_INTERNAL,
3059   .n_errors = ARRAY_LEN(nat44_ei_classify_error_strings),
3060   .error_strings = nat44_ei_classify_error_strings,
3061   .n_next_nodes = NAT44_EI_CLASSIFY_N_NEXT,
3062   .next_nodes = {
3063     [NAT44_EI_CLASSIFY_NEXT_IN2OUT] = "nat44-ei-in2out",
3064     [NAT44_EI_CLASSIFY_NEXT_OUT2IN] = "nat44-ei-out2in",
3065     [NAT44_EI_CLASSIFY_NEXT_DROP] = "error-drop",
3066   },
3067 };
3068
3069 VLIB_NODE_FN (nat44_ei_handoff_classify_node)
3070 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
3071 {
3072   return nat44_ei_classify_inline_fn (vm, node, frame);
3073 }
3074
3075 VLIB_REGISTER_NODE (nat44_ei_handoff_classify_node) = {
3076   .name = "nat44-ei-handoff-classify",
3077   .vector_size = sizeof (u32),
3078   .format_trace = format_nat44_ei_classify_trace,
3079   .type = VLIB_NODE_TYPE_INTERNAL,
3080   .n_errors = ARRAY_LEN(nat44_ei_classify_error_strings),
3081   .error_strings = nat44_ei_classify_error_strings,
3082   .n_next_nodes = NAT44_EI_CLASSIFY_N_NEXT,
3083   .next_nodes = {
3084     [NAT44_EI_CLASSIFY_NEXT_IN2OUT] = "nat44-ei-in2out-worker-handoff",
3085     [NAT44_EI_CLASSIFY_NEXT_OUT2IN] = "nat44-ei-out2in-worker-handoff",
3086     [NAT44_EI_CLASSIFY_NEXT_DROP] = "error-drop",
3087   },
3088 };
3089
3090 /*
3091  * fd.io coding-style-patch-verification: ON
3092  *
3093  * Local Variables:
3094  * eval: (c-set-style "gnu")
3095  * End:
3096  */